further , we believe that we are experiencing an improving but still uncertain global macroeconomic environment in which our customers exercise care and conservatism in their investment prioritization and project deployments . we expect that our customers will remain thoughtful with their capital spending . we believe our product gross margins may decline in the future due to competitive pricing pressures , which may be offset by additional operational improvements and cost efficiencies . nevertheless , we are focused on executing our strategy to address the market trends of mobile internet and cloud computing and we continue to believe there are positive long-term fundamentals for high-performance networking , including high-iq networking , as well as cloud environments for data centers . 33 we continued to invest in innovation and strengthening our product portfolio , which resulted in new product offerings during 2013 , including a series of new products for the enterprise campus and data center infrastructures , including the ex9200 ethernet switch , a programmable core switch , to support emerging applications and growing workloads . additionally , we enhanced our mx series portfolio with the release of the mx104 , the mx2010 , and the mx2020 , service provider edge routers designed for rapid service delivery and application enablement . we also released the world 's smallest supercore , the ptx3000 , to address the scale and flexibility challenges facing service providers as they converge their networks to optimize their business . furthermore , to help enterprise organizations and service providers address the challenges associated with managing multiple , geographically dispersed data centers , we unveiled metafabric , a new architecture for next generation data centers . metafabric simplifies and accelerates the deployment and delivery of applications within and across multiple data center locations . we also announced the availability of juniper networks contrail , a standards-based and highly scalable network virtualization and intelligence solution for sdn and introduced opencontrail , a new initiative that makes the source code library for contrail available through an open source license , which we believe will help to foster innovation in sdn . we also announced enhancements to the sdn-ready mx series 3d universal edge router portfolio that significantly expands system capacity , subscriber bandwidth and service performance . during 2013 , we initiated a restructuring plan ( the `` 2013 restructuring plan `` ) to continue to improve our cost structure and rationalize our product portfolio and rebalance our investments . the 2013 restructuring plan consists of workforce reductions , contract terminations , and project cancellations of which $ 28.3 million were recorded in 2013. we were not able to achieve the full benefit of our cost savings goal of $ 100.0 million in 2013. see note 9 , restructuring and other charges , in notes to consolidated financial statements in item 8 of part ii of this report , for further discussion of our restructuring activities . in february 2014 , we announced an integrated operating plan ( `` iop `` ) to refocus the company on innovation that matters most to service providers and enterprises where demand for high-iq networks and best-in-class cloud environments are driving growth . the iop strategy capitalizes upon our engineering expertise across routing , switching , security , control and network management to align our focus to become a leading provider of secure high-iq networks while serving the needs of cloud builders . through the execution of the iop , we plan to coalesce our engineering talent , go-to-market teams and r & d around this strategy resulting in streamlined operations and business portfolio and operational efficiencies . as we implement the iop , it is possible that our segments may change . 34 financial results and key performance metrics overview the following table provides an overview of our key financial metrics for the years ended december 31 , 2013 , 2012 , and 2011 ( in millions , except per share amounts , percentages , days sales outstanding ( `` dso `` ) , and book-to-bill ) : replace_table_token_6_th ( * ) dso and book-to-bill are for the fourth quarter ended 2013 , 2012 , and 2011. net revenues : during 2013 , compared to 2012 , we experienced net revenue growth in the americas , in both service provider and enterprise , offset by declines in revenue in apac and emea . the year-over-year increase in our net revenues during 2013 was primarily due to increases in edge routing , switching , and services , partially offset by a decline in our security products . gross margin : our gross margin as a percentage of net revenues increased in 2013 , compared to 2012 , primarily due to higher restructuring and other charges recorded in 2012 , partially offset by higher inventory provisions in 2013 for legacy platforms . operating income : our operating income as a percentage of revenues increased in 2013 , compared to 2012 , primarily due to growth in net revenues . also contributing to the increase in operating income were lower restructuring and other charges of $ 52.2 million compared to 2012. stock repurchase plan activity : under our stock repurchase programs , we repurchased approximately 28.9 million shares of our common stock in the open market at an average price of $ 19.76 per share for an aggregate purchase of $ 570.6 million during the year ended december 31 , 2013 . operating cash flows : operating cash flows increased in 2013 , compared to 2012 , primarily due to higher net income , the timing of payments to our vendors , higher deferred revenue , and lower taxes paid , partially offset by the timing of payments for incentive compensation to our employees and the timing of receipts from our customers . 35 dso : dso is calculated as the ratio of ending accounts receivable , net of allowances , divided by average daily net sales for the preceding 90 days . story_separator_special_tag determination of which market a particular revenue transaction relates to is based primarily upon the customer 's industrial classification code , but may also include subjective factors such as the intended use of the product . the service provider market generally includes wireline and wireless carriers , and cable operators , as well as major internet content and application providers , including those that provide social networking and search engine services . the enterprise market generally is comprised of businesses ; federal , state , and local governments ; financial services ; and research and education institutions . 2013 compared to 2012 net revenues from sales to the service provider market increased in 2013 , compared to 2012 , primarily due to an increase in sales to content providers and cable providers in the americas , partially offset by a slight decrease in sales with wireless carriers , while the service provider market in emea and apac was relatively flat . in addition , service provider demand for switching and data center solutions in 2013 was stronger than in 2012. net revenues from the enterprise market increased in 2013 , compared to 2012 , primarily due to broad-based growth in the americas enterprise market , as well as recognition of a large u.s. federal government contract , partially offset by weaker demand in apac and emea . 39 2012 compared to 2011 net revenues from sales to the service provider market decreased in 2012 , compared to 2011 , primarily due to reduced routing purchases by some of our international and content service providers , partially offset by strong growth from large service providers in the americas . net revenues generated from the enterprise market decreased in 2012 , compared to 2011 , primarily due to lower revenue in federal and financial services , offset by our expanding presence in apac and emea . customer no customer accounted for greater than 10 % of our net revenues during the year ended december 31 , 2013 and 2011. during the year ended december 31 , 2012 , verizon accounted for 10.3 % of our net revenues . net revenues by geographic region the following table presents net revenues by geographic region ( in millions , except percentages ) : replace_table_token_9_th 2013 compared to 2012 net revenues in the americas increased in 2013 , compared to 2012 , primarily due to an increase in revenues from both the service provider and enterprise markets . the increase in service provider revenues was due to an increase in sales to content providers and cable providers , partially offset by a slight decrease in sales to carriers . the increase in enterprise revenues in 2013 , compared to 2012 , was primarily attributable to a broad-based improvement in customer demand as well as the recognition of a large u.s. federal government contract . net revenues in emea decreased in 2013 , compared to 2012 , primarily due to a decline in revenues in the enterprise market attributable to certain large sales in 2012. net revenues in apac decreased in 2013 , compared to 2012 , primarily due to lower revenues in enterprise resulting from weaker conditions in the china enterprise market . service provider revenues were relatively flat as a decline in sales with certain large service providers in japan were offset by higher revenue with certain large carriers in china . additionally , the recognition of revenue from a large service provider in singapore was offset by declines in revenues from certain service providers in apac . 2012 compared to 2011 net revenues in the americas increased in 2012 , compared to 2011 , primarily due to increased sales in the united states to certain service providers , offset by a decline in the enterprise market particularly among federal and financial services customers . net revenues in emea decreased in 2012 , compared to 2011 , primarily due to decreased sales in western and southern europe , which we believe was a result of the challenging economic climate in those areas . the decrease was partially offset by increased revenues in the middle east and from a top service provider in eastern europe , across a broad range of our product portfolio . 40 net revenues in apac decreased in 2012 , compared to 2011 , primarily due to a decrease in sales to a certain service provider customer in japan , following a large product deployment that occurred in 2011. gross margins the following table presents gross margins ( in millions , except percentages ) : replace_table_token_10_th 2013 compared to 2012 product gross margin percentage increased slightly in 2013 , compared to 2012 , primarily due to higher restructuring and other charges recorded in 2012 , partially offset by higher inventory provisions in 2013 for legacy platforms . product gross margin benefited from cost reductions in the supply chain in 2013 , which more than offset the impact of higher pricing discounts . service gross margin increased in 2013 , compared to 2012 , primarily due to higher service revenues and greater efficiency in the delivery of services . 2012 compared to 2011 product gross margin percentage decreased in 2012 , compared to 2011 , primarily due to a $ 44.3 million inventory charge related to component inventory held in excess of forecasted demand and to an intangible asset impairment charge of $ 16.1 million related to our 2012 restructuring activities . to a lesser extent , the decrease was due to an increase in the size and number of strategic contracts with lower margins and to a shift in product mix to lower margin products . service gross margin increased in 2012 , compared to 2011 , primarily due to higher service revenues , combined with a continuing focus on operational improvements and cost efficiencies . operating expenses the following table presents operating expenses ( in millions , except percentages ) : replace_table_token_11_th 41 our operating expenses have historically been driven by

liquidity and capital resources historically , we have funded our business primarily through our operating activities , the issuance of our common stock , and the issuance of our long-term debt . the following table shows our capital resources ( in millions , except percentages ) : replace_table_token_16_th 46 the significant components of our working capital are cash and cash equivalents , short-term investments , and accounts receivable , reduced by accounts payable , accrued liabilities , and short-term deferred revenue . working capital increased by $ 83.8 million during the year ended december 31 , 2013 , primarily due to an increase in current assets , primarily accounts receivable and short-term investments , and lower accounts payable , partially offset by a decrease in cash and cash equivalents . summary of cash flows as of december 31 , 2013 , our cash and cash equivalents decreased by $ 123.8 million from december 31 , 2012 primarily due to cash used in our investing and financing activities related to the repurchase of our common stock , purchase of investments , and capital expenditures . the following table summarizes cash flows from our consolidated statements of cash flows ( in millions , except percentages ) : replace_table_token_17_th operating activities 2013 compared to 2012 cash flows from operations increased by $ 199.9 million in 2013 , compared to 2012 , primarily due to higher consolidated net income , the timing of payments to our vendors , higher deferred revenue , and lower taxes paid , partially offset by the timing of payments for incentive compensation to our employees and the timing of collections on our outstanding receivables . 2012 compared to 2011 cash flow from operations decreased by $ 344.3 million in 2012 , compared to 2011 , primarily due to lower consolidated net income , higher taxes paid , timing of payments to our vendors , and a decrease in deferred revenue , offset by the timing of collections of our outstanding receivables .


 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.
     ```liquidity and capital resources historically , we have funded our business primarily through our operating activities , the issuance of our common stock , and the issuance of our long-term debt . the following table shows our capital resources ( in millions , except percentages ) : replace_table_token_16_th 46 the significant components of our working capital are cash and cash equivalents , short-term investments , and accounts receivable , reduced by accounts payable , accrued liabilities , and short-term deferred revenue . working capital increased by $ 83.8 million during the year ended december 31 , 2013 , primarily due to an increase in current assets , primarily accounts receivable and short-term investments , and lower accounts payable , partially offset by a decrease in cash and cash equivalents . summary of cash flows as of december 31 , 2013 , our cash and cash equivalents decreased by $ 123.8 million from december 31 , 2012 primarily due to cash used in our investing and financing activities related to the repurchase of our common stock , purchase of investments , and capital expenditures . the following table summarizes cash flows from our consolidated statements of cash flows ( in millions , except percentages ) : replace_table_token_17_th operating activities 2013 compared to 2012 cash flows from operations increased by $ 199.9 million in 2013 , compared to 2012 , primarily due to higher consolidated net income , the timing of payments to our vendors , higher deferred revenue , and lower taxes paid , partially offset by the timing of payments for incentive compensation to our employees and the timing of collections on our outstanding receivables . 2012 compared to 2011 cash flow from operations decreased by $ 344.3 million in 2012 , compared to 2011 , primarily due to lower consolidated net income , higher taxes paid , timing of payments to our vendors , and a decrease in deferred revenue , offset by the timing of collections of our outstanding receivables .
```    
 Suspicious Activity Report : further , we believe that we are experiencing an improving but still uncertain global macroeconomic environment in which our customers exercise care and conservatism in their investment prioritization and project deployments . we expect that our customers will remain thoughtful with their capital spending . we believe our product gross margins may decline in the future due to competitive pricing pressures , which may be offset by additional operational improvements and cost efficiencies . nevertheless , we are focused on executing our strategy to address the market trends of mobile internet and cloud computing and we continue to believe there are positive long-term fundamentals for high-performance networking , including high-iq networking , as well as cloud environments for data centers . 33 we continued to invest in innovation and strengthening our product portfolio , which resulted in new product offerings during 2013 , including a series of new products for the enterprise campus and data center infrastructures , including the ex9200 ethernet switch , a programmable core switch , to support emerging applications and growing workloads . additionally , we enhanced our mx series portfolio with the release of the mx104 , the mx2010 , and the mx2020 , service provider edge routers designed for rapid service delivery and application enablement . we also released the world 's smallest supercore , the ptx3000 , to address the scale and flexibility challenges facing service providers as they converge their networks to optimize their business . furthermore , to help enterprise organizations and service providers address the challenges associated with managing multiple , geographically dispersed data centers , we unveiled metafabric , a new architecture for next generation data centers . metafabric simplifies and accelerates the deployment and delivery of applications within and across multiple data center locations . we also announced the availability of juniper networks contrail , a standards-based and highly scalable network virtualization and intelligence solution for sdn and introduced opencontrail , a new initiative that makes the source code library for contrail available through an open source license , which we believe will help to foster innovation in sdn . we also announced enhancements to the sdn-ready mx series 3d universal edge router portfolio that significantly expands system capacity , subscriber bandwidth and service performance . during 2013 , we initiated a restructuring plan ( the `` 2013 restructuring plan `` ) to continue to improve our cost structure and rationalize our product portfolio and rebalance our investments . the 2013 restructuring plan consists of workforce reductions , contract terminations , and project cancellations of which $ 28.3 million were recorded in 2013. we were not able to achieve the full benefit of our cost savings goal of $ 100.0 million in 2013. see note 9 , restructuring and other charges , in notes to consolidated financial statements in item 8 of part ii of this report , for further discussion of our restructuring activities . in february 2014 , we announced an integrated operating plan ( `` iop `` ) to refocus the company on innovation that matters most to service providers and enterprises where demand for high-iq networks and best-in-class cloud environments are driving growth . the iop strategy capitalizes upon our engineering expertise across routing , switching , security , control and network management to align our focus to become a leading provider of secure high-iq networks while serving the needs of cloud builders . through the execution of the iop , we plan to coalesce our engineering talent , go-to-market teams and r & d around this strategy resulting in streamlined operations and business portfolio and operational efficiencies . as we implement the iop , it is possible that our segments may change . 34 financial results and key performance metrics overview the following table provides an overview of our key financial metrics for the years ended december 31 , 2013 , 2012 , and 2011 ( in millions , except per share amounts , percentages , days sales outstanding ( `` dso `` ) , and book-to-bill ) : replace_table_token_6_th ( * ) dso and book-to-bill are for the fourth quarter ended 2013 , 2012 , and 2011. net revenues : during 2013 , compared to 2012 , we experienced net revenue growth in the americas , in both service provider and enterprise , offset by declines in revenue in apac and emea . the year-over-year increase in our net revenues during 2013 was primarily due to increases in edge routing , switching , and services , partially offset by a decline in our security products . gross margin : our gross margin as a percentage of net revenues increased in 2013 , compared to 2012 , primarily due to higher restructuring and other charges recorded in 2012 , partially offset by higher inventory provisions in 2013 for legacy platforms . operating income : our operating income as a percentage of revenues increased in 2013 , compared to 2012 , primarily due to growth in net revenues . also contributing to the increase in operating income were lower restructuring and other charges of $ 52.2 million compared to 2012. stock repurchase plan activity : under our stock repurchase programs , we repurchased approximately 28.9 million shares of our common stock in the open market at an average price of $ 19.76 per share for an aggregate purchase of $ 570.6 million during the year ended december 31 , 2013 . operating cash flows : operating cash flows increased in 2013 , compared to 2012 , primarily due to higher net income , the timing of payments to our vendors , higher deferred revenue , and lower taxes paid , partially offset by the timing of payments for incentive compensation to our employees and the timing of receipts from our customers . 35 dso : dso is calculated as the ratio of ending accounts receivable , net of allowances , divided by average daily net sales for the preceding 90 days . story_separator_special_tag determination of which market a particular revenue transaction relates to is based primarily upon the customer 's industrial classification code , but may also include subjective factors such as the intended use of the product . the service provider market generally includes wireline and wireless carriers , and cable operators , as well as major internet content and application providers , including those that provide social networking and search engine services . the enterprise market generally is comprised of businesses ; federal , state , and local governments ; financial services ; and research and education institutions . 2013 compared to 2012 net revenues from sales to the service provider market increased in 2013 , compared to 2012 , primarily due to an increase in sales to content providers and cable providers in the americas , partially offset by a slight decrease in sales with wireless carriers , while the service provider market in emea and apac was relatively flat . in addition , service provider demand for switching and data center solutions in 2013 was stronger than in 2012. net revenues from the enterprise market increased in 2013 , compared to 2012 , primarily due to broad-based growth in the americas enterprise market , as well as recognition of a large u.s. federal government contract , partially offset by weaker demand in apac and emea . 39 2012 compared to 2011 net revenues from sales to the service provider market decreased in 2012 , compared to 2011 , primarily due to reduced routing purchases by some of our international and content service providers , partially offset by strong growth from large service providers in the americas . net revenues generated from the enterprise market decreased in 2012 , compared to 2011 , primarily due to lower revenue in federal and financial services , offset by our expanding presence in apac and emea . customer no customer accounted for greater than 10 % of our net revenues during the year ended december 31 , 2013 and 2011. during the year ended december 31 , 2012 , verizon accounted for 10.3 % of our net revenues . net revenues by geographic region the following table presents net revenues by geographic region ( in millions , except percentages ) : replace_table_token_9_th 2013 compared to 2012 net revenues in the americas increased in 2013 , compared to 2012 , primarily due to an increase in revenues from both the service provider and enterprise markets . the increase in service provider revenues was due to an increase in sales to content providers and cable providers , partially offset by a slight decrease in sales to carriers . the increase in enterprise revenues in 2013 , compared to 2012 , was primarily attributable to a broad-based improvement in customer demand as well as the recognition of a large u.s. federal government contract . net revenues in emea decreased in 2013 , compared to 2012 , primarily due to a decline in revenues in the enterprise market attributable to certain large sales in 2012. net revenues in apac decreased in 2013 , compared to 2012 , primarily due to lower revenues in enterprise resulting from weaker conditions in the china enterprise market . service provider revenues were relatively flat as a decline in sales with certain large service providers in japan were offset by higher revenue with certain large carriers in china . additionally , the recognition of revenue from a large service provider in singapore was offset by declines in revenues from certain service providers in apac . 2012 compared to 2011 net revenues in the americas increased in 2012 , compared to 2011 , primarily due to increased sales in the united states to certain service providers , offset by a decline in the enterprise market particularly among federal and financial services customers . net revenues in emea decreased in 2012 , compared to 2011 , primarily due to decreased sales in western and southern europe , which we believe was a result of the challenging economic climate in those areas . the decrease was partially offset by increased revenues in the middle east and from a top service provider in eastern europe , across a broad range of our product portfolio . 40 net revenues in apac decreased in 2012 , compared to 2011 , primarily due to a decrease in sales to a certain service provider customer in japan , following a large product deployment that occurred in 2011. gross margins the following table presents gross margins ( in millions , except percentages ) : replace_table_token_10_th 2013 compared to 2012 product gross margin percentage increased slightly in 2013 , compared to 2012 , primarily due to higher restructuring and other charges recorded in 2012 , partially offset by higher inventory provisions in 2013 for legacy platforms . product gross margin benefited from cost reductions in the supply chain in 2013 , which more than offset the impact of higher pricing discounts . service gross margin increased in 2013 , compared to 2012 , primarily due to higher service revenues and greater efficiency in the delivery of services . 2012 compared to 2011 product gross margin percentage decreased in 2012 , compared to 2011 , primarily due to a $ 44.3 million inventory charge related to component inventory held in excess of forecasted demand and to an intangible asset impairment charge of $ 16.1 million related to our 2012 restructuring activities . to a lesser extent , the decrease was due to an increase in the size and number of strategic contracts with lower margins and to a shift in product mix to lower margin products . service gross margin increased in 2012 , compared to 2011 , primarily due to higher service revenues , combined with a continuing focus on operational improvements and cost efficiencies . operating expenses the following table presents operating expenses ( in millions , except percentages ) : replace_table_token_11_th 41 our operating expenses have historically been driven by

