our manufacturing segment sales depend on industry demand for new railcars , which is driven by overall economic conditions and the demand for railcar transportation of various products , such as coal , steel products , minerals , cement , motor vehicles , forest products and agricultural commodities . our manufacturing segment sales are also affected by competitive market pressures that impact our market share , the prices for our railcars and by the types of railcars sold . our manufacturing segment revenues also include revenues from major railcar rebuilds and lease rental payments received with respect to railcars under operating leases . our corporate and other revenue sources include parts sales and , through september 30 , 2015 , revenues from our repair and maintenance business that was sold in september 2015. we generally manufacture railcars under firm orders from our customers . we recognize revenue , when ( 1 ) we complete the individual railcars , ( 2 ) the railcars are accepted by the customer following inspection , ( 3 ) the risk of any damage or other loss with respect to the railcars passes to the customer and ( 4 ) title to the railcars transfers to the customer . deliveries include new and used cars sold , cars built and contracted under operating leases and rebuilt cars . we value used railcars received at their estimated fair market value . revenues derived from a single sales contract that contains multiple products and services are allocated based on the relative fair value of each item to be delivered and recognized in accordance with the applicable revenue recognition criteria for the specific unit of accounting . the variable purchase patterns of our customers and the timing of completion , delivery and customer acceptance of railcars may cause our revenues and income from operations to vary substantially each quarter , which will result in significant fluctuations in our quarterly results . cost of sales our cost of sales includes the cost of raw materials such as aluminum and steel , as well as the cost of finished railcar components , such as castings , wheels , truck components and couplers , and other specialty components . our cost of sales also includes labor , utilities , freight , manufacturing depreciation and other operating costs . factors that have affected our cost of sales include the cost of steel and aluminum and the cost of railcar components , which have been impacted by the increase in industry demand . as we expanded , although we strove to reduce manufacturing costs at our manufacturing facilities , our cost of sales has been negatively impacted by production inefficiencies and idle capacity as we entered into new railcar markets and invested in diversifying our product portfolio . a portion of the contracts covering our backlog at december 31 , 2016 are fixed-rate contracts . therefore , if material costs were to increase , we will likely not be able to pass on these increased costs to our customers . we manage material price increases by locking in prices where possible . operating income ( loss ) operating income ( loss ) represents revenues less cost of sales , gain on sale of railcars available for lease , gain on sale of railcar repair and maintenance services business , selling , general and administrative expenses , and restructuring and impairment charges . results of operations year ended december 31 , 2016 compared to year ended december 31 , 2015 revenues our consolidated revenues for the year ended december 31 , 2016 were $ 523.7 million compared to $ 772.9 million for the year ended december 31 , 2015. manufacturing segment revenues for the year ended december 31 , 2016 were $ 516.1 million compared to $ 745.7 million for the year ended december 31 , 2015. the decrease in manufacturing segment revenues for 2016 compared to 2015 reflects the 38 % decrease in the number of railcars delivered , partially offset by a higher mix of new versus rebuilt railcars . corporate and other revenues for the year ended december 31 , 2016 were $ 7.7 million compared to $ 27.1 million for the year ended december 31 , 2015 , which for the year ended december 31 , 2015 included revenue from our repair and maintenance business that was sold in september 2015 . 20 gross profit our consolidated gross profit margin was 7.7 % for the year ended december 31 , 2016 compared to 10.7 % for the year ended december 31 , 2015. our consolidated gross profit for the year ended december 31 , 2016 was $ 40.2 million compared to $ 82.7 million for the year ended december 31 , 2015 , reflecting a decrease in gross profit from our manufacturing segment of $ 39.8 million and a decrease in gross profit from corporate and other of $ 2.7 million . the 38 % decline in railcar deliveries in 2016 contributed a $ 38.3 million decrease in gross profit in our manufacturing segment and production inefficiencies , net of a favorable sales mix of cars sold , contributed to a $ 2.8 million decrease in gross profit in our manufacturing segment . product warranty expense was $ 1.4 million lower for the year ended december 31 , 2016 compared to the same period last year . the decrease in gross profit for corporate and other for the year ended december 31 , 2016 compared to the year ended december 31 , 2015 reflects the sale of the company 's repair and maintenance business , which was partially offset by a $ 2.6 million decrease in postretirement benefit plan costs due to the settlement with our hourly retirees . story_separator_special_tag the credit agreement has both affirmative and negative covenants , including , without limitation , the maximum consolidated net leverage ratio requirement and limitations on indebtedness , liens and investments . the credit agreement also provides for customary events of default . as of december 31 , 2016 and 2015 , we had no borrowings under the revolving credit facility ( as in effect on such date ) . as of december 31 , 2016 and 2015 , we had $ 5.7 million and $ 6.9 million , respectively , in outstanding letters of credit under the revolving credit facility ( as in effect on such date ) and therefore had $ 44.3 million and $ 43.1 million , respectively , available for borrowing under the revolving credit facility . our restricted cash and restricted certificates of deposit balance was $ 6.0 million as of december 31 , 2016 and $ 6.9 million as of december 31 , 2015 , and consisted of cash and certificates of deposit used to collateralize standby letters of credit with respect to performance guarantees and to support our worker 's compensation insurance claims . the decrease in restricted cash balances as of december 31 , 2016 compared to december 31 , 2015 was a result of decreases in standby letters of credit with respect to performance guarantees and our corresponding obligation to collateralize them . the standby letters of credit outstanding as of december 31 , 2016 are scheduled to expire at 24 various dates through january 31 , 2018. we expect to establish restricted cash balances and restricted certificates of deposit in future periods to minimize bank fees related to standby letters of credit . based on our current level of operations and known changes in planned volume based on our backlog , we believe that our operating cash flows and our cash balances , together with amounts available under our revolving credit facility , will be sufficient to meet our expected liquidity needs . our long-term liquidity is contingent upon future operating performance and our ability to continue to meet financial covenants under our revolving credit facility and any other indebtedness . we may also require additional capital in the future to fund working capital as demand for railcars increases , payments for contractual obligations , organic growth opportunities , including new plant and equipment and development of railcars , joint ventures , international expansion and acquisitions , and these capital requirements could be substantial . we historically provided pension and retiree welfare benefits to certain salaried and hourly employees upon their retirement . benefits under our pension plans are now frozen and will not be impacted by increases due to future service and compensation increases . the most significant assumptions used in determining our net periodic benefit costs are the discount rate used on our pension and postretirement welfare obligations and expected return on pension plan assets . as of december 31 , 2016 , our benefit obligation under our defined benefit pension plans was $ 53.3 million , which exceeded the fair value of plan assets by $ 6.8 million . we made no contributions to our defined benefit pension plans during 2016 and are not required to make any contributions to our defined benefit pension plans in 2017. the pension protection act of 2006 provides for changes to the method of valuing pension plan assets and liabilities for funding purposes as well as minimum funding levels . our defined benefit pension plans are in compliance with the minimum funding levels established in the pension protection act . funding levels will be affected by future contributions , investment returns on plan assets , growth in plan liabilities and interest rates . assuming that the plans are fully funded as that term is defined in the pension protection act , we will be required to fund the ongoing growth in plan liabilities on an annual basis . a substantial portion of our $ 72.9 million postretirement benefit plan obligation as of december 31 , 2015 related to an expired settlement agreement with the union representing employees at our and our predecessors ' johnstown manufacturing facilities . on march 25 , 2016 , we made a one-time payment of $ 31.7 million to settle our postretirement benefit obligation for our hourly retirees , resulting in a pre-tax gain of $ 14.3 million ( net of plaintiffs ' attorneys ' fees of $ 1.3 million ) . as of december 31 , 2016 , our benefit obligation under our postretirement benefit plan was $ 6.2 million , which exceeded the fair value of plan assets by $ 6.2 million . we made contributions to our postretirement benefit plan of $ 0.5 million for salaried retirees during 2016 and expect to make $ 0.4 million in contributions to our postretirement benefit plan in 2017 for salaried retirees . as a result of the settlement payment , we have no further postretirement benefit obligation for hourly retirees . based upon our operating performance and capital requirements , we may , from time to time , be required to raise additional funds through additional offerings of our common stock and through long-term borrowings . there can be no assurance that long-term debt , if needed , will be available on terms attractive to us , or at all . furthermore , any additional equity financing may be dilutive to stockholders and debt financing , if available , may involve restrictive covenants . our failure to raise capital if and when needed could have a material adverse effect on our results of operations and financial condition . contractual obligations the following table summarizes our contractual obligations as of december 31 , 2016 , and the effect that these obligations would be expected to have on our liquidity and cash flow in future periods : replace_table_token_5_th 25 material and component purchases consist of non-cancelable agreements with suppliers to purchase materials used in the manufacturing process . the estimated

cash flows the following table summarizes our net cash provided by or used in operating activities , investing activities and financing activities for the years ended december 31 , 2016 , 2015 and 2014 : replace_table_token_6_th operating activities . our net cash provided by or used in operating activities reflects net income or loss adjusted for non-cash charges and changes in operating assets and liabilities . cash flows from operating activities are affected by several factors , including fluctuations in business volume , contract terms for billings and collections , the timing of collections on our contract receivables , processing of bi-weekly payroll and associated taxes , and payments to our suppliers . as some of our customers accept delivery of new railcars in train-set quantities , variations in our sales lead to significant fluctuations in our operating profits and cash from operating activities . we do not usually experience business credit issues , although a payment may be delayed pending completion of closing documentation . our net cash provided by operating activities for the year ended december 31 , 2016 was $ 0.2 million compared to net cash used in operating activities of $ 65.7 million for the year ended december 31 , 2015. our net cash provided by operating activities for the year ended december 31 , 2016 reflects decreases in working capital , including a $ 17.1 million decrease in inventory and a $ 15.9 million decrease in accounts receivable , which were offset by the cash payment of $ 31.6 million and payment of plaintiffs ' attorneys ' fees of $ 1.3 million for settlement of the postretirement benefit obligation for our hourly retirees . additionally , at december 31 , 2016 we had an income tax receivable of $ 13.3 million , most of which related to the carryback claim of our 2016 federal net taxable loss , which will be carried back against the 2015 tax year .


 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 flows the following table summarizes our net cash provided by or used in operating activities , investing activities and financing activities for the years ended december 31 , 2016 , 2015 and 2014 : replace_table_token_6_th operating activities . our net cash provided by or used in operating activities reflects net income or loss adjusted for non-cash charges and changes in operating assets and liabilities . cash flows from operating activities are affected by several factors , including fluctuations in business volume , contract terms for billings and collections , the timing of collections on our contract receivables , processing of bi-weekly payroll and associated taxes , and payments to our suppliers . as some of our customers accept delivery of new railcars in train-set quantities , variations in our sales lead to significant fluctuations in our operating profits and cash from operating activities . we do not usually experience business credit issues , although a payment may be delayed pending completion of closing documentation . our net cash provided by operating activities for the year ended december 31 , 2016 was $ 0.2 million compared to net cash used in operating activities of $ 65.7 million for the year ended december 31 , 2015. our net cash provided by operating activities for the year ended december 31 , 2016 reflects decreases in working capital , including a $ 17.1 million decrease in inventory and a $ 15.9 million decrease in accounts receivable , which were offset by the cash payment of $ 31.6 million and payment of plaintiffs ' attorneys ' fees of $ 1.3 million for settlement of the postretirement benefit obligation for our hourly retirees . additionally , at december 31 , 2016 we had an income tax receivable of $ 13.3 million , most of which related to the carryback claim of our 2016 federal net taxable loss , which will be carried back against the 2015 tax year .
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 Suspicious Activity Report : our manufacturing segment sales depend on industry demand for new railcars , which is driven by overall economic conditions and the demand for railcar transportation of various products , such as coal , steel products , minerals , cement , motor vehicles , forest products and agricultural commodities . our manufacturing segment sales are also affected by competitive market pressures that impact our market share , the prices for our railcars and by the types of railcars sold . our manufacturing segment revenues also include revenues from major railcar rebuilds and lease rental payments received with respect to railcars under operating leases . our corporate and other revenue sources include parts sales and , through september 30 , 2015 , revenues from our repair and maintenance business that was sold in september 2015. we generally manufacture railcars under firm orders from our customers . we recognize revenue , when ( 1 ) we complete the individual railcars , ( 2 ) the railcars are accepted by the customer following inspection , ( 3 ) the risk of any damage or other loss with respect to the railcars passes to the customer and ( 4 ) title to the railcars transfers to the customer . deliveries include new and used cars sold , cars built and contracted under operating leases and rebuilt cars . we value used railcars received at their estimated fair market value . revenues derived from a single sales contract that contains multiple products and services are allocated based on the relative fair value of each item to be delivered and recognized in accordance with the applicable revenue recognition criteria for the specific unit of accounting . the variable purchase patterns of our customers and the timing of completion , delivery and customer acceptance of railcars may cause our revenues and income from operations to vary substantially each quarter , which will result in significant fluctuations in our quarterly results . cost of sales our cost of sales includes the cost of raw materials such as aluminum and steel , as well as the cost of finished railcar components , such as castings , wheels , truck components and couplers , and other specialty components . our cost of sales also includes labor , utilities , freight , manufacturing depreciation and other operating costs . factors that have affected our cost of sales include the cost of steel and aluminum and the cost of railcar components , which have been impacted by the increase in industry demand . as we expanded , although we strove to reduce manufacturing costs at our manufacturing facilities , our cost of sales has been negatively impacted by production inefficiencies and idle capacity as we entered into new railcar markets and invested in diversifying our product portfolio . a portion of the contracts covering our backlog at december 31 , 2016 are fixed-rate contracts . therefore , if material costs were to increase , we will likely not be able to pass on these increased costs to our customers . we manage material price increases by locking in prices where possible . operating income ( loss ) operating income ( loss ) represents revenues less cost of sales , gain on sale of railcars available for lease , gain on sale of railcar repair and maintenance services business , selling , general and administrative expenses , and restructuring and impairment charges . results of operations year ended december 31 , 2016 compared to year ended december 31 , 2015 revenues our consolidated revenues for the year ended december 31 , 2016 were $ 523.7 million compared to $ 772.9 million for the year ended december 31 , 2015. manufacturing segment revenues for the year ended december 31 , 2016 were $ 516.1 million compared to $ 745.7 million for the year ended december 31 , 2015. the decrease in manufacturing segment revenues for 2016 compared to 2015 reflects the 38 % decrease in the number of railcars delivered , partially offset by a higher mix of new versus rebuilt railcars . corporate and other revenues for the year ended december 31 , 2016 were $ 7.7 million compared to $ 27.1 million for the year ended december 31 , 2015 , which for the year ended december 31 , 2015 included revenue from our repair and maintenance business that was sold in september 2015 . 20 gross profit our consolidated gross profit margin was 7.7 % for the year ended december 31 , 2016 compared to 10.7 % for the year ended december 31 , 2015. our consolidated gross profit for the year ended december 31 , 2016 was $ 40.2 million compared to $ 82.7 million for the year ended december 31 , 2015 , reflecting a decrease in gross profit from our manufacturing segment of $ 39.8 million and a decrease in gross profit from corporate and other of $ 2.7 million . the 38 % decline in railcar deliveries in 2016 contributed a $ 38.3 million decrease in gross profit in our manufacturing segment and production inefficiencies , net of a favorable sales mix of cars sold , contributed to a $ 2.8 million decrease in gross profit in our manufacturing segment . product warranty expense was $ 1.4 million lower for the year ended december 31 , 2016 compared to the same period last year . the decrease in gross profit for corporate and other for the year ended december 31 , 2016 compared to the year ended december 31 , 2015 reflects the sale of the company 's repair and maintenance business , which was partially offset by a $ 2.6 million decrease in postretirement benefit plan costs due to the settlement with our hourly retirees . story_separator_special_tag the credit agreement has both affirmative and negative covenants , including , without limitation , the maximum consolidated net leverage ratio requirement and limitations on indebtedness , liens and investments . the credit agreement also provides for customary events of default . as of december 31 , 2016 and 2015 , we had no borrowings under the revolving credit facility ( as in effect on such date ) . as of december 31 , 2016 and 2015 , we had $ 5.7 million and $ 6.9 million , respectively , in outstanding letters of credit under the revolving credit facility ( as in effect on such date ) and therefore had $ 44.3 million and $ 43.1 million , respectively , available for borrowing under the revolving credit facility . our restricted cash and restricted certificates of deposit balance was $ 6.0 million as of december 31 , 2016 and $ 6.9 million as of december 31 , 2015 , and consisted of cash and certificates of deposit used to collateralize standby letters of credit with respect to performance guarantees and to support our worker 's compensation insurance claims . the decrease in restricted cash balances as of december 31 , 2016 compared to december 31 , 2015 was a result of decreases in standby letters of credit with respect to performance guarantees and our corresponding obligation to collateralize them . the standby letters of credit outstanding as of december 31 , 2016 are scheduled to expire at 24 various dates through january 31 , 2018. we expect to establish restricted cash balances and restricted certificates of deposit in future periods to minimize bank fees related to standby letters of credit . based on our current level of operations and known changes in planned volume based on our backlog , we believe that our operating cash flows and our cash balances , together with amounts available under our revolving credit facility , will be sufficient to meet our expected liquidity needs . our long-term liquidity is contingent upon future operating performance and our ability to continue to meet financial covenants under our revolving credit facility and any other indebtedness . we may also require additional capital in the future to fund working capital as demand for railcars increases , payments for contractual obligations , organic growth opportunities , including new plant and equipment and development of railcars , joint ventures , international expansion and acquisitions , and these capital requirements could be substantial . we historically provided pension and retiree welfare benefits to certain salaried and hourly employees upon their retirement . benefits under our pension plans are now frozen and will not be impacted by increases due to future service and compensation increases . the most significant assumptions used in determining our net periodic benefit costs are the discount rate used on our pension and postretirement welfare obligations and expected return on pension plan assets . as of december 31 , 2016 , our benefit obligation under our defined benefit pension plans was $ 53.3 million , which exceeded the fair value of plan assets by $ 6.8 million . we made no contributions to our defined benefit pension plans during 2016 and are not required to make any contributions to our defined benefit pension plans in 2017. the pension protection act of 2006 provides for changes to the method of valuing pension plan assets and liabilities for funding purposes as well as minimum funding levels . our defined benefit pension plans are in compliance with the minimum funding levels established in the pension protection act . funding levels will be affected by future contributions , investment returns on plan assets , growth in plan liabilities and interest rates . assuming that the plans are fully funded as that term is defined in the pension protection act , we will be required to fund the ongoing growth in plan liabilities on an annual basis . a substantial portion of our $ 72.9 million postretirement benefit plan obligation as of december 31 , 2015 related to an expired settlement agreement with the union representing employees at our and our predecessors ' johnstown manufacturing facilities . on march 25 , 2016 , we made a one-time payment of $ 31.7 million to settle our postretirement benefit obligation for our hourly retirees , resulting in a pre-tax gain of $ 14.3 million ( net of plaintiffs ' attorneys ' fees of $ 1.3 million ) . as of december 31 , 2016 , our benefit obligation under our postretirement benefit plan was $ 6.2 million , which exceeded the fair value of plan assets by $ 6.2 million . we made contributions to our postretirement benefit plan of $ 0.5 million for salaried retirees during 2016 and expect to make $ 0.4 million in contributions to our postretirement benefit plan in 2017 for salaried retirees . as a result of the settlement payment , we have no further postretirement benefit obligation for hourly retirees . based upon our operating performance and capital requirements , we may , from time to time , be required to raise additional funds through additional offerings of our common stock and through long-term borrowings . there can be no assurance that long-term debt , if needed , will be available on terms attractive to us , or at all . furthermore , any additional equity financing may be dilutive to stockholders and debt financing , if available , may involve restrictive covenants . our failure to raise capital if and when needed could have a material adverse effect on our results of operations and financial condition . contractual obligations the following table summarizes our contractual obligations as of december 31 , 2016 , and the effect that these obligations would be expected to have on our liquidity and cash flow in future periods : replace_table_token_5_th 25 material and component purchases consist of non-cancelable agreements with suppliers to purchase materials used in the manufacturing process . the estimated

