these decreases were partially offset by an increase in nonfuel gross margin in excess of site level operating expenses generated by our locations . as described under the heading `` other disputes `` in note 13 to the notes to consolidated financial statements included in item 15 of this annual report , comdata has purported to terminate its merchant agreement with us and , beginning february 1 , 2017 , unilaterally increased the fees it withholds from the transaction settlement payments due to us . we believe that comdata has wrongfully terminated our agreement and raised the fees we pay comdata , and we are pursuing litigation against comdata . however , if we do not prevail in our pending litigation against comdata , we may not be able to recover the increased fees comdata charges us through higher prices to customers , and our operating expenses may increase . 38 factors affecting comparability transaction agreement with hpt on june 1 , 2015 , we entered a transaction agreement with hpt , which we and hpt amended on june 22 , 2016. we refer to this amended transaction agreement as the transaction agreement . under the transaction agreement , among other things , we agreed to sell to hpt 16 existing travel centers we owned and certain assets at 11 properties currently leased from hpt , plus four additional travel centers upon our completion of their development , and hpt agreed to lease back these properties and assets to us under the hpt leases . we also agreed to purchase from hpt five travel centers we previously leased from hpt . during the year ended december 31 , 2015 , we sold 14 travel centers and certain assets at 11 properties currently leased from hpt for an aggregate of $ 279,383 and purchased five travel centers from hpt for $ 45,042 . the resulting net increase of our minimum annual rent under our ta leases was $ 20,153. on march 31 , 2016 , we sold one of the development properties to hpt for $ 19,683 , and our minimum annual rent due to hpt increased by $ 1,673 . on june 22 , 2016 , we sold two existing travel centers for an aggregate of $ 23,876 , and our minimum annual rent due to hpt increased by $ 2,029 . on june 30 , 2016 , we sold one of the development properties to hpt for $ 22,297 , and our minimum annual rent due to hpt increased by $ 1,895 . on september 30 , 2016 , we sold one of the development properties to hpt for $ 16,557 , and our minimum annual rent due to hpt increased by $ 1,407 . see notes 7 and 12 to the notes to consolidated financial statements included in item 15 of this annual report for more information about our transaction agreement with hpt . acquired and developed sites since the beginning of 2011 , when we began our acquisition program , to december 31 , 2016 , we have invested $ 855,003 to develop , purchase and improve 318 travel centers , convenience stores and standalone restaurants . for the year ended december 31 , 2016 , these investments produced site level gross margin in excess of site level operating expenses of $ 99,957 , or , on a sequential basis , $ 8,253 , or 9.0 % , greater than site level gross margin in excess of site level operating expenses for the twelve months ended september 30 , 2016. we believe that our investments require a period after they are developed or acquired and upgrades are completed to reach their expected stabilized financial results , generally three years for travel centers and one year for convenience stores . we acquired or developed 39 travel centers during the 2011 to 2016 period . of those , 36 are included in the `` travel centers segment same site operating data `` for the years ended december 31 , 2016 and 2015. as of december 31 , 2016 , we have invested $ 312,139 ( including improvements ) in these 36 locations , and they generated $ 54,271 of gross margin in excess of site level operating expenses during the year ended december 31 , 2016 . the remaining three locations were developed by us for a total investment of $ 64,862 ; and they generated $ 3,526 of gross margin in excess of site level operating expenses during the year ended december 31 , 2016 ; however , we have operated these locations for less than the full year 2016 ( one opened in each of january , march and may ) . we acquired 228 convenience stores during the 2013 to 2016 period . of these , 31 are included in the `` convenience store segment same site operating data `` for the years ended december 31 , 2016 and 2015. as of december 31 , 2016 , we have invested $ 66,491 ( including improvements ) in these 31 locations , and they generated $ 11,608 of gross margin in excess of site level operating expenses during the year ended december 31 , 2016 . the remaining 197 locations were acquired by us in 2015 or 2016 for a total investment of $ 376,854 ( including improvements ) , and these convenience stores generated $ 23,237 of gross margin in excess of site level operating expenses during the year ended december 31 , 2016 . the 29 convenience stores we acquired during 2016 were operated by us for an average of nine months during 2016 and some of these were fully or partially out of service while being renovated . story_separator_special_tag replace_table_token_14_th 46 the following table presents our same site operating results for our convenience store segment for the year ended december 31 , 2016 , as compared to the year ended december 31 , 2015 , and for the year ended december 31 , 2015 , as compared to the year ended december 31 , 2014 . replace_table_token_15_th year ended december 31 , 2016 , as compared to december 31 , 2015 revenues . fuel revenues for 2016 increase d by $ 195,853 , or 87.1 % , as compared to 2015 . the table below shows the changes in total fuel revenues for our convenience store segment based on price and volume changes between periods . replace_table_token_16_th the increase in fuel revenues in our convenience store segment was due to sales volume at acquired locations , partially offset by decreases in market prices for fuel and a decrease in fuel sales volume on a same site basis . on a same site basis , fuel sales volume for 2016 decrease d by 632 gallons , or 1.5 % , as compared to 2015 . the decrease in same site fuel sales volume was primarily due to our adjusting fuel sales pricing to manage fuel sales volume and profitability and the effects of competition . nonfuel revenues for 2016 increase d by $ 139,655 , or 90.0 % , as compared to 2015 . the increase in nonfuel revenues was primarily due to acquired locations . on a same site basis , nonfuel revenues increase d modestly as operations at acquired sites continue to stabilize . site level gross margin in excess of site level operating expenses . site level gross margin in excess of site level operating expenses for 2016 increase d by $ 19,401 , or 112.4 % , as compared to 2015 , primarily due to acquired locations . 47 on a same site basis , site level gross margin in excess of site level operating expenses for 2016 increase d as compared to 2015 due to an increase in nonfuel gross margin due to a favorable change in the mix of products and services sold and an increase in fuel gross margin primarily resulting from our continued focus on adjusting our fuel sales pricing to manage profitability . year ended december 31 , 2015 , as compared to december 31 , 2014 revenues . fuel revenues for 2015 increase d by $ 111,673 , or 98.6 % as compared to 2014 . the table below shows the changes in total fuel revenues for our convenience store segment based on price and volume changes between periods . replace_table_token_17_th the increase in fuel revenues at our convenience store segment reflected increases in sales volume from both sites we acquired during 2015 and same sites , partially offset by decreases in market prices for fuel . on a same site basis , fuel sales volume for 2015 increase d by 1,642 gallons , or 4.1 % , from 2014 . nonfuel revenues for 2015 increase d by $ 78,563 , or 102.5 % , from 2014 . the increase in nonfuel revenues was primarily due to the sites we acquired during 2015 . on a same site basis , nonfuel revenues increase d by $ 3,023 , or 3.9 % , for 2015 , as compared to 2014 , primarily due to the favorable effects of certain of our marketing initiatives . site level gross margin in excess of site level operating expenses . site level gross margin in excess of site level operating expenses for 2015 increase d by $ 8,425 , or 95.4 % , from 2014 , due to locations acquired in 2015 and a $ 3,550 , or 40.2 % , increase on a same site basis . on a same site basis , site level gross margin in excess of site level operating expenses increase d for 2015 as compared to 2014 , due to an increase in nonfuel gross margin due to a favorable change in the mix or products and services sold , an increase in fuel gross margin primarily resulting from our continued focus on adjusting our fuel sales pricing to manage fuel sales volume and profitability , partially offset by an increase in site level operating expenses . 48 liquidity and capital resources our principal liquidity requirements are to meet our operating and financing costs and to fund our capital expenditures , acquisitions and working capital requirements . our principal sources of liquidity to meet these requirements are our : cash balance ; operating cash flow ; our credit facility , with a current maximum availability of $ 200,000 , or our credit facility , subject to limits based on our qualified collateral ; sales to hpt of improvements we make to the sites we lease from hpt and the development site to be sold to hpt under the transaction agreement ; potential issuances of new debt and equity securities ; and potential financing or selling of unencumbered real estate that we own . we believe that the primary risks we currently face with respect to our operating cash flow are : continuing decreased demand for our fuel products resulting from regulatory and market efforts for improved engine fuel efficiency and fuel conservation generally ; decreased demand for our products and services that we may experience as a result of competition ; a significant portion of our expenses are fixed in nature , which may restrict our ability to realize a sufficient reduction in our expenses to offset a reduction in our revenues ; the possible inability of recently acquired or developed properties to generate the stabilized financial results we expect ; the risk of an economic slowdown or recession ; and the negative impacts on our gross margins and working capital requirements if there were a return to the higher level of prices for petroleum products we experienced during the first half of 2014 and in prior years ,

cash flow from operating activities in 2016 , we had net cash inflows from operating activities of $ 110,777 , a decrease of $ 26,111 compared to $ 136,888 in 2015 . the decrease was primarily due a decrease in cash from the net income attributable to common shareholders in 2015 to net loss attributable to common shareholders in 2016 , partially offset by lower working capital in 2016 as compared to 2015 . in 2015 , we had net cash inflows from operating activities of $ 136,888 , a decrease of $ 24,237 compared to $ 161,125 in 2014 . the decrease was primarily due to lower net income partially offset by lower net working capital in 2015 as compared to 2014 . 50 cash flow from investing activities in 2016 , we had cash outflows from investing activities of $ 220,038 , a decrease of $ 17,439 compared to $ 237,477 in 2015 . the decrease was primarily due to a reduction in our acquisition activities , partially offset by lower proceeds from asset sales to hpt and higher capital expenditures in 2016 than in 2015. in 2016 , we invested $ 71,935 for the acquisition of 29 convenience stores , 11 standalone restaurants and franchise agreements for an additional 39 standalone restaurants and invested $ 329,997 for other capital improvements to our properties . in 2016 , we received $ 193,082 of proceeds from the sales of five properties and assets to hpt , including improvements to properties we lease from hpt . in 2015 , we had cash outflows from investing activities of $ 237,477 , an increase of $ 103,059 compared to $ 134,418 in 2014 . the increase was primarily due to capital expenditures and cash invested for acquisitions , partially offset by proceeds from the sale of assets to hpt . in 2015 , we invested $ 320,290 for the acquisition of three travel centers and 169 convenience stores , and we made investments of $ 295,437 for other capital improvements to our properties .


 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 in 2016 , we had net cash inflows from operating activities of $ 110,777 , a decrease of $ 26,111 compared to $ 136,888 in 2015 . the decrease was primarily due a decrease in cash from the net income attributable to common shareholders in 2015 to net loss attributable to common shareholders in 2016 , partially offset by lower working capital in 2016 as compared to 2015 . in 2015 , we had net cash inflows from operating activities of $ 136,888 , a decrease of $ 24,237 compared to $ 161,125 in 2014 . the decrease was primarily due to lower net income partially offset by lower net working capital in 2015 as compared to 2014 . 50 cash flow from investing activities in 2016 , we had cash outflows from investing activities of $ 220,038 , a decrease of $ 17,439 compared to $ 237,477 in 2015 . the decrease was primarily due to a reduction in our acquisition activities , partially offset by lower proceeds from asset sales to hpt and higher capital expenditures in 2016 than in 2015. in 2016 , we invested $ 71,935 for the acquisition of 29 convenience stores , 11 standalone restaurants and franchise agreements for an additional 39 standalone restaurants and invested $ 329,997 for other capital improvements to our properties . in 2016 , we received $ 193,082 of proceeds from the sales of five properties and assets to hpt , including improvements to properties we lease from hpt . in 2015 , we had cash outflows from investing activities of $ 237,477 , an increase of $ 103,059 compared to $ 134,418 in 2014 . the increase was primarily due to capital expenditures and cash invested for acquisitions , partially offset by proceeds from the sale of assets to hpt . in 2015 , we invested $ 320,290 for the acquisition of three travel centers and 169 convenience stores , and we made investments of $ 295,437 for other capital improvements to our properties .
```    
 Suspicious Activity Report : these decreases were partially offset by an increase in nonfuel gross margin in excess of site level operating expenses generated by our locations . as described under the heading `` other disputes `` in note 13 to the notes to consolidated financial statements included in item 15 of this annual report , comdata has purported to terminate its merchant agreement with us and , beginning february 1 , 2017 , unilaterally increased the fees it withholds from the transaction settlement payments due to us . we believe that comdata has wrongfully terminated our agreement and raised the fees we pay comdata , and we are pursuing litigation against comdata . however , if we do not prevail in our pending litigation against comdata , we may not be able to recover the increased fees comdata charges us through higher prices to customers , and our operating expenses may increase . 38 factors affecting comparability transaction agreement with hpt on june 1 , 2015 , we entered a transaction agreement with hpt , which we and hpt amended on june 22 , 2016. we refer to this amended transaction agreement as the transaction agreement . under the transaction agreement , among other things , we agreed to sell to hpt 16 existing travel centers we owned and certain assets at 11 properties currently leased from hpt , plus four additional travel centers upon our completion of their development , and hpt agreed to lease back these properties and assets to us under the hpt leases . we also agreed to purchase from hpt five travel centers we previously leased from hpt . during the year ended december 31 , 2015 , we sold 14 travel centers and certain assets at 11 properties currently leased from hpt for an aggregate of $ 279,383 and purchased five travel centers from hpt for $ 45,042 . the resulting net increase of our minimum annual rent under our ta leases was $ 20,153. on march 31 , 2016 , we sold one of the development properties to hpt for $ 19,683 , and our minimum annual rent due to hpt increased by $ 1,673 . on june 22 , 2016 , we sold two existing travel centers for an aggregate of $ 23,876 , and our minimum annual rent due to hpt increased by $ 2,029 . on june 30 , 2016 , we sold one of the development properties to hpt for $ 22,297 , and our minimum annual rent due to hpt increased by $ 1,895 . on september 30 , 2016 , we sold one of the development properties to hpt for $ 16,557 , and our minimum annual rent due to hpt increased by $ 1,407 . see notes 7 and 12 to the notes to consolidated financial statements included in item 15 of this annual report for more information about our transaction agreement with hpt . acquired and developed sites since the beginning of 2011 , when we began our acquisition program , to december 31 , 2016 , we have invested $ 855,003 to develop , purchase and improve 318 travel centers , convenience stores and standalone restaurants . for the year ended december 31 , 2016 , these investments produced site level gross margin in excess of site level operating expenses of $ 99,957 , or , on a sequential basis , $ 8,253 , or 9.0 % , greater than site level gross margin in excess of site level operating expenses for the twelve months ended september 30 , 2016. we believe that our investments require a period after they are developed or acquired and upgrades are completed to reach their expected stabilized financial results , generally three years for travel centers and one year for convenience stores . we acquired or developed 39 travel centers during the 2011 to 2016 period . of those , 36 are included in the `` travel centers segment same site operating data `` for the years ended december 31 , 2016 and 2015. as of december 31 , 2016 , we have invested $ 312,139 ( including improvements ) in these 36 locations , and they generated $ 54,271 of gross margin in excess of site level operating expenses during the year ended december 31 , 2016 . the remaining three locations were developed by us for a total investment of $ 64,862 ; and they generated $ 3,526 of gross margin in excess of site level operating expenses during the year ended december 31 , 2016 ; however , we have operated these locations for less than the full year 2016 ( one opened in each of january , march and may ) . we acquired 228 convenience stores during the 2013 to 2016 period . of these , 31 are included in the `` convenience store segment same site operating data `` for the years ended december 31 , 2016 and 2015. as of december 31 , 2016 , we have invested $ 66,491 ( including improvements ) in these 31 locations , and they generated $ 11,608 of gross margin in excess of site level operating expenses during the year ended december 31 , 2016 . the remaining 197 locations were acquired by us in 2015 or 2016 for a total investment of $ 376,854 ( including improvements ) , and these convenience stores generated $ 23,237 of gross margin in excess of site level operating expenses during the year ended december 31 , 2016 . the 29 convenience stores we acquired during 2016 were operated by us for an average of nine months during 2016 and some of these were fully or partially out of service while being renovated . story_separator_special_tag replace_table_token_14_th 46 the following table presents our same site operating results for our convenience store segment for the year ended december 31 , 2016 , as compared to the year ended december 31 , 2015 , and for the year ended december 31 , 2015 , as compared to the year ended december 31 , 2014 . replace_table_token_15_th year ended december 31 , 2016 , as compared to december 31 , 2015 revenues . fuel revenues for 2016 increase d by $ 195,853 , or 87.1 % , as compared to 2015 . the table below shows the changes in total fuel revenues for our convenience store segment based on price and volume changes between periods . replace_table_token_16_th the increase in fuel revenues in our convenience store segment was due to sales volume at acquired locations , partially offset by decreases in market prices for fuel and a decrease in fuel sales volume on a same site basis . on a same site basis , fuel sales volume for 2016 decrease d by 632 gallons , or 1.5 % , as compared to 2015 . the decrease in same site fuel sales volume was primarily due to our adjusting fuel sales pricing to manage fuel sales volume and profitability and the effects of competition . nonfuel revenues for 2016 increase d by $ 139,655 , or 90.0 % , as compared to 2015 . the increase in nonfuel revenues was primarily due to acquired locations . on a same site basis , nonfuel revenues increase d modestly as operations at acquired sites continue to stabilize . site level gross margin in excess of site level operating expenses . site level gross margin in excess of site level operating expenses for 2016 increase d by $ 19,401 , or 112.4 % , as compared to 2015 , primarily due to acquired locations . 47 on a same site basis , site level gross margin in excess of site level operating expenses for 2016 increase d as compared to 2015 due to an increase in nonfuel gross margin due to a favorable change in the mix of products and services sold and an increase in fuel gross margin primarily resulting from our continued focus on adjusting our fuel sales pricing to manage profitability . year ended december 31 , 2015 , as compared to december 31 , 2014 revenues . fuel revenues for 2015 increase d by $ 111,673 , or 98.6 % as compared to 2014 . the table below shows the changes in total fuel revenues for our convenience store segment based on price and volume changes between periods . replace_table_token_17_th the increase in fuel revenues at our convenience store segment reflected increases in sales volume from both sites we acquired during 2015 and same sites , partially offset by decreases in market prices for fuel . on a same site basis , fuel sales volume for 2015 increase d by 1,642 gallons , or 4.1 % , from 2014 . nonfuel revenues for 2015 increase d by $ 78,563 , or 102.5 % , from 2014 . the increase in nonfuel revenues was primarily due to the sites we acquired during 2015 . on a same site basis , nonfuel revenues increase d by $ 3,023 , or 3.9 % , for 2015 , as compared to 2014 , primarily due to the favorable effects of certain of our marketing initiatives . site level gross margin in excess of site level operating expenses . site level gross margin in excess of site level operating expenses for 2015 increase d by $ 8,425 , or 95.4 % , from 2014 , due to locations acquired in 2015 and a $ 3,550 , or 40.2 % , increase on a same site basis . on a same site basis , site level gross margin in excess of site level operating expenses increase d for 2015 as compared to 2014 , due to an increase in nonfuel gross margin due to a favorable change in the mix or products and services sold , an increase in fuel gross margin primarily resulting from our continued focus on adjusting our fuel sales pricing to manage fuel sales volume and profitability , partially offset by an increase in site level operating expenses . 48 liquidity and capital resources our principal liquidity requirements are to meet our operating and financing costs and to fund our capital expenditures , acquisitions and working capital requirements . our principal sources of liquidity to meet these requirements are our : cash balance ; operating cash flow ; our credit facility , with a current maximum availability of $ 200,000 , or our credit facility , subject to limits based on our qualified collateral ; sales to hpt of improvements we make to the sites we lease from hpt and the development site to be sold to hpt under the transaction agreement ; potential issuances of new debt and equity securities ; and potential financing or selling of unencumbered real estate that we own . we believe that the primary risks we currently face with respect to our operating cash flow are : continuing decreased demand for our fuel products resulting from regulatory and market efforts for improved engine fuel efficiency and fuel conservation generally ; decreased demand for our products and services that we may experience as a result of competition ; a significant portion of our expenses are fixed in nature , which may restrict our ability to realize a sufficient reduction in our expenses to offset a reduction in our revenues ; the possible inability of recently acquired or developed properties to generate the stabilized financial results we expect ; the risk of an economic slowdown or recession ; and the negative impacts on our gross margins and working capital requirements if there were a return to the higher level of prices for petroleum products we experienced during the first half of 2014 and in prior years ,

