we had volume increases in nearly all of our service lines , but also experienced pricing declines , which impacted our net revenue margins . truckload margin compression was a challenge to our earnings per share during the second half of the year . in september 2016 , we completed the acquisition of apc logistics ( “ apc ” ) , a privately held company based in australia , for the purpose of expanding our global presence and bringing additional capabilities and expertise to our portfolio . apc provides international freight forwarding and customs brokerage services in australia and new zealand . apc operates in our global forwarding segment . fuel prices declined throughout 2015 , which contributed to slower growth of our total revenues and an increase in our transportation net revenue margins . in 2015 , we completed the acquisition of freightquote.com , inc. ( “ freightquote ” ) , a privately held freight broker based in kansas city , missouri . freightquote provides services throughout north america . the acquisition enhances and brings synergies to our ltl and truckload businesses , and expands our ecommerce capabilities . freightquote operates in our nast segment . 24 we keep our personnel and other operating expenses as variable as possible . compensation is tied to productivity and performance . each office is responsible for its hiring and headcount decisions , based on the needs of their office and to balance personnel resources with business requirements . this helps keep our personnel expense as variable as possible with the business . our office network . our office network is a competitive advantage . building local customer and contract carrier relationships has been an important part of our success , and our worldwide network of offices supports our core strategy of serving customers locally , nationally , and globally . our network of offices helps us penetrate local markets , provides face-to-face service when needed , and enables us to recruit contract carriers . our network also gives us knowledge of local market conditions , which is important in the transportation industry because it is market driven and very dynamic . our people . because we are a service company , our continued success is dependent on our ability to continue to hire and retain talented , productive people , and to properly align our headcount and personnel expense with our business . our headcount increased by 949 employees during 2017 , which includes approximately 325 employees added as a result of the milgram acquisition . compensation programs are performance-based and cash incentives are directly tied to productivity and performance . most network management compensation is dependent on the profitability of their particular office . we believe this makes our employees more service-oriented and focused on driving growth and maximizing office productivity . all of our managers and certain other employees who have significant responsibilities are eligible to receive equity awards because we believe these awards are an effective tool for creating long-term ownership and alignment between employees and our shareholders . our customers . in 2017 , we worked with more than 120,000 customers . we work with a wide variety of companies , ranging in size from fortune 100 companies to small family businesses , in many different industries . our customer base is very diverse and unconcentrated . in 2017 , our top 100 customers represented approximately 35 percent of our total revenues and approximately 23 percent of our net revenues . our largest customer was approximately two percent of our total revenues . our contracted carriers . our contracted carrier base includes motor carriers , railroads ( primarily intermodal service providers ) , air freight , and ocean carriers . in 2017 , we worked with approximately 73,000 transportation providers worldwide , up from approximately 71,000 in 2016 . motor carriers with fewer than 100 tractors transported approximately 82 percent of our truckload shipments in 2017 . in our transportation business , no single contracted carrier represents more than approximately two percent of our contracted carrier capacity . consolidated results of operations the following table summarizes our total revenues by service line ( dollars in thousands ) : replace_table_token_8_th the following table illustrates our net revenue margins by service line : replace_table_token_9_th 25 the following table summarizes our net revenues by service line ( dollars in thousands ) : replace_table_token_10_th ( 1 ) less than truckload ( “ ltl ” ) . the following table represents certain statements of operations data , shown as percentages of our net revenues : replace_table_token_11_th 26 the following table summarizes our results by reportable segment ( dollars in thousands ) : replace_table_token_12_th 2017 compared to 2016 total revenues and direct costs . total transportation revenues increased 15.4 percent to $ 13.5 billion in 2017 from $ 11.7 billion in 2016 . this increase in transportation revenues was driven by volume increases in all of our transportation services and increased customer pricing in most services . total purchased transportation and related services increased 17.9 percent in 2017 to $ 11.3 billion from $ 9.5 billion in 2016 . this increase was due to increased transportation costs and higher volumes in nearly all of our transportation services . total sourcing revenues decreased 5.1 percent to $ 1.37 billion in 2017 from $ 1.44 billion in 2016 . purchased products sourced for resale decreased 5.5 percent in 2017 to $ 1.2 billion from $ 1.3 billion in 2016 . these decreases were primarily due to lower market pricing and change in service mix . net revenues . total transportation net revenues increased 4.2 percent in 2017 to $ 2.25 billion from $ 2.15 billion in 2016 . our transportation net revenue margin decreased to 16.6 percent in 2017 from 18.4 percent in 2016 . this decrease in net revenue margin was driven by increases in transportation costs , including fuel . story_separator_special_tag diluted net income per share increased 2.3 percent to $ 3.59 in 2016 from $ 3.51 in 2015 . 30 segment results of operations-2016 compared to 2015 north american surface transportation . nast total revenues decreased 2.6 percent to $ 8.7 billion in 2016 compared to $ 9.0 billion in 2015. this was primarily due to decreased pricing to our customers , partially offset by increased volumes . nast cost of purchased transportation and related services decreased 2.6 percent to $ 7.2 billion in 2016 from $ 7.4 billion in 2015. this decrease was primarily due to lower transportation costs . total nast net revenues decreased 2.6 percent to $ 1.5 billion in 2016 from $ 1.6 billion in 2015. the decrease was driven by a decline in truckload and intermodal net revenues , partially offset by an increase in ltl net revenues . nast truckload net revenues decreased 4.7 percent in 2016 to $ 1.1 billion from $ 1.2 billion in 2015. nast truckload volumes increased approximately 5.5 percent in 2016 compared to 2015. nast truckload net revenue margin decreased in 2016 compared to 2015 , due primarily to lower customer pricing . nast truckload net revenues accounted for approximately 92 percent of our total north america truckload net revenues in 2016 and 2015. the majority of the remaining north american truckload net revenues is included in robinson fresh . excluding the estimated impacts of the change in fuel prices , our average north america truckload rate per mile charged to our customers decreased approximately 5.0 percent in 2016 compared to 2015. excluding the estimated impacts of the change in fuel prices , our average north america truckload transportation cost per mile decreased approximately 4.5 percent in 2016 compared to 2015. nast ltl net revenues increased 5.1 percent in 2016 to $ 366.1 million from $ 348.3 million in 2015. nast ltl volumes increased approximately 7.5 percent in 2016 compared to 2015 , and net revenue margin increased slightly . nast intermodal net revenues decreased 20.1 percent to $ 31.3 million in 2016 from $ 39.2 million in 2015. this was primarily due to declines in net revenue margin and volumes . during 2016 , intermodal opportunities were negatively impacted by the alternative lower-cost truck market . nast operating expenses increased 0.4 percent in 2016 to $ 849.9 million from $ 846.6 million in 2015. this was primarily due to increases in selling , general , and administrative expenses , partially offset by a decrease in personnel expenses related to incentive plans that are designed to keep expenses variable with changes in net revenues and profitability . the operating expenses of nast and all other segments include allocated corporate expenses . nast operating income decreased 6.1 percent to $ 674.4 million in 2016 from $ 718.3 million in 2015. this was primarily due to a decline in total revenues and net revenues caused by lower customer pricing . global forwarding . global forwarding total revenues decreased 4.0 percent to $ 1.57 billion in 2016 from $ 1.64 billion in 2015. this decrease was primarily related to lower customer pricing across ocean and air services , partially offset by increased volumes in all services . global forwarding costs of transportation and related services decreased 7.6 percent to $ 1.2 billion in 2016 from $ 1.3 billion in 2015. global forwarding net revenues increased 8.8 percent to $ 397.5 million in 2016 from $ 365.5 million in 2015. global forwarding net revenue margin increased due to transportation costs declining at a faster rate than customer pricing . ocean transportation net revenues increased 9.4 percent to $ 244.2 million in 2016 from $ 223.3 million in 2015. this was primarily due to increases in volumes . air net revenues increased 3.9 percent to $ 76.1 million in 2016 from $ 73.3 million in 2015. this was primarily due to increases in volumes offset by pricing declines . customs net revenues increased 14.9 percent to $ 50.5 million in 2016 from $ 44.0 million in 2015. the increase was primarily due to increased transaction volumes . global forwarding operating expenses increased 9.4 percent in 2016 to $ 316.6 million from $ 289.4 million in 2015. this increase was primarily due to an increase in claims expense , and the acquisition of apc on september 30 , 2016. global forwarding operating income increased 6.4 percent in 2016 to $ 80.9 million from $ 76.1 million in 2015. this was primarily due to an increase in net revenues driven by higher volumes , partially offset by increased operating expenses . robinson fresh . robinson fresh total revenues decreased 2.1 percent to $ 2.3 billion in 2016 from $ 2.4 billion in 2015. robinson fresh costs of transportation and related services and purchased products sourced for resale decreased 2.4 percent in to $ 2.1 billion in 2016 from $ 2.2 billion in 2015. robinson fresh net revenues decreased 0.2 percent to $ 234.8 million in 2016 from $ 235.3 million in 2015. this decrease was due to declines in transportation net revenues , partially offset by an increase in sourcing net revenue . robinson fresh net revenues from sourcing services increased 1.4 percent to $ 122.7 million in 2016 from $ 121.0 million in 2015. this increase was primarily due to a case volume increase across a variety of commodities and services , partially offset by a decrease in net revenue per case . robinson fresh net revenues from transportation services decreased 2.0 percent to 31 $ 112.1 million in 2016 from $ 114.4 million in 2015. robinson fresh transportation net revenue margin decreased in 2016 compared to 2015 , due primarily to lower customer pricing . robinson fresh operating expenses increased 3.3 percent to $ 159.0 million in 2016 from $ 154.0 million in 2015. this increase was primarily due to an increase in warehousing expenses . in 2016 , growth in robinson fresh headcount was offset by a decrease in variable compensation . robinson

cash flow from operating activities . we generated $ 384.0 million , $ 529.4 million , and $ 718.3 million of cash flow from operations in 2017 , 2016 , and 2015. the decrease of $ 145.4 million and in cash flow from operations in 2017 from 2016 is primarily the result of increased working capital driven by the impact of increased volumes and a deterioration of our accounts receivable aging . the decrease of $ 188.9 million in cash flow from operations in 2016 from 2015 is primarily the result of increases in accounts receivable , partially offset by an increase in accounts payable . the increases in accounts receivable and accounts payable are primarily the result of increased volumes . additionally , accruals for variable compensation were lower in 2016 compared to 2015. cash used for investing activities . we used $ 107.5 million , $ 313.0 million , and $ 54.4 million of cash for investing activities in 2017 , 2016 , and 2015. our investing activities consist primarily of capital expenditures and cash paid for acquisitions . in 2017 , we paid $ 47.3 million for the acquisition of milgram . in 2016 , we paid $ 220.2 million for the acquisition of apc . we used $ 57.9 million , $ 91.4 million , and $ 44.6 million of cash for capital expenditures in 2017 , 2016 , and 2015. we spent $ 29.0 million , $ 25.0 million , and $ 26.0 million in 2017 , 2016 , and 2015 primarily for annual investments in information technology equipment to support our operating systems , including the purchase and development of software . these information technology investments are intended to improve efficiencies and help grow the business . additionally , in 2016 , we completed construction of a second data recovery center . the cost of this data recovery center was $ 20.0 million , $ 19.3 million of which was spent in 2016. we anticipate capital expenditures in 2018 to be approximately $ 60 to $ 70 million . 32 cash used for financing activities . we used $ 202.1 million , $ 127.3


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```cash flow from operating activities . we generated $ 384.0 million , $ 529.4 million , and $ 718.3 million of cash flow from operations in 2017 , 2016 , and 2015. the decrease of $ 145.4 million and in cash flow from operations in 2017 from 2016 is primarily the result of increased working capital driven by the impact of increased volumes and a deterioration of our accounts receivable aging . the decrease of $ 188.9 million in cash flow from operations in 2016 from 2015 is primarily the result of increases in accounts receivable , partially offset by an increase in accounts payable . the increases in accounts receivable and accounts payable are primarily the result of increased volumes . additionally , accruals for variable compensation were lower in 2016 compared to 2015. cash used for investing activities . we used $ 107.5 million , $ 313.0 million , and $ 54.4 million of cash for investing activities in 2017 , 2016 , and 2015. our investing activities consist primarily of capital expenditures and cash paid for acquisitions . in 2017 , we paid $ 47.3 million for the acquisition of milgram . in 2016 , we paid $ 220.2 million for the acquisition of apc . we used $ 57.9 million , $ 91.4 million , and $ 44.6 million of cash for capital expenditures in 2017 , 2016 , and 2015. we spent $ 29.0 million , $ 25.0 million , and $ 26.0 million in 2017 , 2016 , and 2015 primarily for annual investments in information technology equipment to support our operating systems , including the purchase and development of software . these information technology investments are intended to improve efficiencies and help grow the business . additionally , in 2016 , we completed construction of a second data recovery center . the cost of this data recovery center was $ 20.0 million , $ 19.3 million of which was spent in 2016. we anticipate capital expenditures in 2018 to be approximately $ 60 to $ 70 million . 32 cash used for financing activities . we used $ 202.1 million , $ 127.3
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 Suspicious Activity Report : we had volume increases in nearly all of our service lines , but also experienced pricing declines , which impacted our net revenue margins . truckload margin compression was a challenge to our earnings per share during the second half of the year . in september 2016 , we completed the acquisition of apc logistics ( “ apc ” ) , a privately held company based in australia , for the purpose of expanding our global presence and bringing additional capabilities and expertise to our portfolio . apc provides international freight forwarding and customs brokerage services in australia and new zealand . apc operates in our global forwarding segment . fuel prices declined throughout 2015 , which contributed to slower growth of our total revenues and an increase in our transportation net revenue margins . in 2015 , we completed the acquisition of freightquote.com , inc. ( “ freightquote ” ) , a privately held freight broker based in kansas city , missouri . freightquote provides services throughout north america . the acquisition enhances and brings synergies to our ltl and truckload businesses , and expands our ecommerce capabilities . freightquote operates in our nast segment . 24 we keep our personnel and other operating expenses as variable as possible . compensation is tied to productivity and performance . each office is responsible for its hiring and headcount decisions , based on the needs of their office and to balance personnel resources with business requirements . this helps keep our personnel expense as variable as possible with the business . our office network . our office network is a competitive advantage . building local customer and contract carrier relationships has been an important part of our success , and our worldwide network of offices supports our core strategy of serving customers locally , nationally , and globally . our network of offices helps us penetrate local markets , provides face-to-face service when needed , and enables us to recruit contract carriers . our network also gives us knowledge of local market conditions , which is important in the transportation industry because it is market driven and very dynamic . our people . because we are a service company , our continued success is dependent on our ability to continue to hire and retain talented , productive people , and to properly align our headcount and personnel expense with our business . our headcount increased by 949 employees during 2017 , which includes approximately 325 employees added as a result of the milgram acquisition . compensation programs are performance-based and cash incentives are directly tied to productivity and performance . most network management compensation is dependent on the profitability of their particular office . we believe this makes our employees more service-oriented and focused on driving growth and maximizing office productivity . all of our managers and certain other employees who have significant responsibilities are eligible to receive equity awards because we believe these awards are an effective tool for creating long-term ownership and alignment between employees and our shareholders . our customers . in 2017 , we worked with more than 120,000 customers . we work with a wide variety of companies , ranging in size from fortune 100 companies to small family businesses , in many different industries . our customer base is very diverse and unconcentrated . in 2017 , our top 100 customers represented approximately 35 percent of our total revenues and approximately 23 percent of our net revenues . our largest customer was approximately two percent of our total revenues . our contracted carriers . our contracted carrier base includes motor carriers , railroads ( primarily intermodal service providers ) , air freight , and ocean carriers . in 2017 , we worked with approximately 73,000 transportation providers worldwide , up from approximately 71,000 in 2016 . motor carriers with fewer than 100 tractors transported approximately 82 percent of our truckload shipments in 2017 . in our transportation business , no single contracted carrier represents more than approximately two percent of our contracted carrier capacity . consolidated results of operations the following table summarizes our total revenues by service line ( dollars in thousands ) : replace_table_token_8_th the following table illustrates our net revenue margins by service line : replace_table_token_9_th 25 the following table summarizes our net revenues by service line ( dollars in thousands ) : replace_table_token_10_th ( 1 ) less than truckload ( “ ltl ” ) . the following table represents certain statements of operations data , shown as percentages of our net revenues : replace_table_token_11_th 26 the following table summarizes our results by reportable segment ( dollars in thousands ) : replace_table_token_12_th 2017 compared to 2016 total revenues and direct costs . total transportation revenues increased 15.4 percent to $ 13.5 billion in 2017 from $ 11.7 billion in 2016 . this increase in transportation revenues was driven by volume increases in all of our transportation services and increased customer pricing in most services . total purchased transportation and related services increased 17.9 percent in 2017 to $ 11.3 billion from $ 9.5 billion in 2016 . this increase was due to increased transportation costs and higher volumes in nearly all of our transportation services . total sourcing revenues decreased 5.1 percent to $ 1.37 billion in 2017 from $ 1.44 billion in 2016 . purchased products sourced for resale decreased 5.5 percent in 2017 to $ 1.2 billion from $ 1.3 billion in 2016 . these decreases were primarily due to lower market pricing and change in service mix . net revenues . total transportation net revenues increased 4.2 percent in 2017 to $ 2.25 billion from $ 2.15 billion in 2016 . our transportation net revenue margin decreased to 16.6 percent in 2017 from 18.4 percent in 2016 . this decrease in net revenue margin was driven by increases in transportation costs , including fuel . story_separator_special_tag diluted net income per share increased 2.3 percent to $ 3.59 in 2016 from $ 3.51 in 2015 . 30 segment results of operations-2016 compared to 2015 north american surface transportation . nast total revenues decreased 2.6 percent to $ 8.7 billion in 2016 compared to $ 9.0 billion in 2015. this was primarily due to decreased pricing to our customers , partially offset by increased volumes . nast cost of purchased transportation and related services decreased 2.6 percent to $ 7.2 billion in 2016 from $ 7.4 billion in 2015. this decrease was primarily due to lower transportation costs . total nast net revenues decreased 2.6 percent to $ 1.5 billion in 2016 from $ 1.6 billion in 2015. the decrease was driven by a decline in truckload and intermodal net revenues , partially offset by an increase in ltl net revenues . nast truckload net revenues decreased 4.7 percent in 2016 to $ 1.1 billion from $ 1.2 billion in 2015. nast truckload volumes increased approximately 5.5 percent in 2016 compared to 2015. nast truckload net revenue margin decreased in 2016 compared to 2015 , due primarily to lower customer pricing . nast truckload net revenues accounted for approximately 92 percent of our total north america truckload net revenues in 2016 and 2015. the majority of the remaining north american truckload net revenues is included in robinson fresh . excluding the estimated impacts of the change in fuel prices , our average north america truckload rate per mile charged to our customers decreased approximately 5.0 percent in 2016 compared to 2015. excluding the estimated impacts of the change in fuel prices , our average north america truckload transportation cost per mile decreased approximately 4.5 percent in 2016 compared to 2015. nast ltl net revenues increased 5.1 percent in 2016 to $ 366.1 million from $ 348.3 million in 2015. nast ltl volumes increased approximately 7.5 percent in 2016 compared to 2015 , and net revenue margin increased slightly . nast intermodal net revenues decreased 20.1 percent to $ 31.3 million in 2016 from $ 39.2 million in 2015. this was primarily due to declines in net revenue margin and volumes . during 2016 , intermodal opportunities were negatively impacted by the alternative lower-cost truck market . nast operating expenses increased 0.4 percent in 2016 to $ 849.9 million from $ 846.6 million in 2015. this was primarily due to increases in selling , general , and administrative expenses , partially offset by a decrease in personnel expenses related to incentive plans that are designed to keep expenses variable with changes in net revenues and profitability . the operating expenses of nast and all other segments include allocated corporate expenses . nast operating income decreased 6.1 percent to $ 674.4 million in 2016 from $ 718.3 million in 2015. this was primarily due to a decline in total revenues and net revenues caused by lower customer pricing . global forwarding . global forwarding total revenues decreased 4.0 percent to $ 1.57 billion in 2016 from $ 1.64 billion in 2015. this decrease was primarily related to lower customer pricing across ocean and air services , partially offset by increased volumes in all services . global forwarding costs of transportation and related services decreased 7.6 percent to $ 1.2 billion in 2016 from $ 1.3 billion in 2015. global forwarding net revenues increased 8.8 percent to $ 397.5 million in 2016 from $ 365.5 million in 2015. global forwarding net revenue margin increased due to transportation costs declining at a faster rate than customer pricing . ocean transportation net revenues increased 9.4 percent to $ 244.2 million in 2016 from $ 223.3 million in 2015. this was primarily due to increases in volumes . air net revenues increased 3.9 percent to $ 76.1 million in 2016 from $ 73.3 million in 2015. this was primarily due to increases in volumes offset by pricing declines . customs net revenues increased 14.9 percent to $ 50.5 million in 2016 from $ 44.0 million in 2015. the increase was primarily due to increased transaction volumes . global forwarding operating expenses increased 9.4 percent in 2016 to $ 316.6 million from $ 289.4 million in 2015. this increase was primarily due to an increase in claims expense , and the acquisition of apc on september 30 , 2016. global forwarding operating income increased 6.4 percent in 2016 to $ 80.9 million from $ 76.1 million in 2015. this was primarily due to an increase in net revenues driven by higher volumes , partially offset by increased operating expenses . robinson fresh . robinson fresh total revenues decreased 2.1 percent to $ 2.3 billion in 2016 from $ 2.4 billion in 2015. robinson fresh costs of transportation and related services and purchased products sourced for resale decreased 2.4 percent in to $ 2.1 billion in 2016 from $ 2.2 billion in 2015. robinson fresh net revenues decreased 0.2 percent to $ 234.8 million in 2016 from $ 235.3 million in 2015. this decrease was due to declines in transportation net revenues , partially offset by an increase in sourcing net revenue . robinson fresh net revenues from sourcing services increased 1.4 percent to $ 122.7 million in 2016 from $ 121.0 million in 2015. this increase was primarily due to a case volume increase across a variety of commodities and services , partially offset by a decrease in net revenue per case . robinson fresh net revenues from transportation services decreased 2.0 percent to 31 $ 112.1 million in 2016 from $ 114.4 million in 2015. robinson fresh transportation net revenue margin decreased in 2016 compared to 2015 , due primarily to lower customer pricing . robinson fresh operating expenses increased 3.3 percent to $ 159.0 million in 2016 from $ 154.0 million in 2015. this increase was primarily due to an increase in warehousing expenses . in 2016 , growth in robinson fresh headcount was offset by a decrease in variable compensation . robinson

