we evaluate our estimates , including those related to revenue recognition , allowance for doubtful accounts , inventories , goodwill , warranty obligations , contingencies and income taxes on an on-going basis . we base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances , the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources . actual results may differ from these estimates under different assumptions or conditions . senior management has discussed the development , selection and disclosure of these estimates with the audit committee of our board of directors . we believe the following critical accounting policies and the related judgments and estimates affect the preparation of our consolidated financial statements . 32 revenue recognition . revenue is recognized when persuasive evidence of an arrangement exists , upon delivery of the product to the customer at a fixed or determinable price with a reasonable assurance of collection , passage of title and risk of loss to the customer as indicated by the contractual terms and fulfillment of all significant obligations . we design , market and sell our products primarily as commercial , off-the-shelf products . certain customers request different system configurations , generally based on standard options or accessories that we offer . in general , our revenue arrangements do not involve acceptance provisions based upon customer specified acceptance criteria . in those circumstances when customer specified acceptance criteria exist , revenue is deferred until customer acceptance if we can not demonstrate that the system meets those specifications prior to shipment . for any contracts with multiple elements ( i.e . , training , installation , additional parts , etc . ) we allocate revenue among the deliverables primarily based upon objective and reliable evidence of fair value of each element in the arrangement . if objective and reliable evidence of fair value of any element is not available , we use an estimated selling price for purposes of allocating the total arrangement consideration among the elements . in addition , judgments are required in evaluating the credit worthiness of our customers . credit is not extended to customers and revenue is not recognized until we have determined that collectability is reasonably assured . allowance for doubtful accounts . our policy is to maintain allowances for estimated losses resulting from the inability of our customers to make required payments . credit limits are established through a process of reviewing the financial history and stability of each customer . where appropriate , we obtain credit rating reports and financial statements of the customer when determining or modifying their credit limits . we regularly evaluate the collectability of our trade receivable balances based on a combination of factors . when a customer 's account balance becomes past due , we initiate dialogue with the customer to determine the cause . if it is determined that the customer will be unable to meet its financial obligation to us , such as in the case of a bankruptcy filing , deterioration in the customer 's operating results or financial position or other material events impacting their business , we record a specific allowance to reduce the related receivable to the amount we expect to recover given all information presently available . actual write-offs during the past three years have not been material to our results of operations . we also record an allowance for all other customers based on certain other factors including the length of time the receivables are past due and historical collection experience with individual customers . as of december 31 , 2015 , our accounts receivable balance of $ 326.1 million is reported net of allowances for doubtful accounts of $ 6.9 million . we believe our reported allowances at december 31 , 2015 are adequate . if the financial conditions of those customers were to deteriorate , however , resulting in their inability to make payments , we may need to record additional allowances that would result in additional selling , general and administrative expenses being recorded for the period in which such determination is made . inventory . our policy is to record inventory write-downs when conditions exist that indicate that our inventories are likely to be in excess of anticipated demand or are obsolete based upon our assumptions about future demand for our products and market conditions . we regularly evaluate the ability to realize the value of our inventories based on a combination of factors including the following : historical usage rates , forecasted sales or usage , product end of life dates , estimated current and future market values and new product introductions . purchasing requirements and alternative usages are evaluated within these processes to mitigate inventory exposure . when recorded , our write-downs are intended to reduce the carrying value of our inventories to their net realizable value and establish a new cost basis . as of december 31 , 2015 , our inventories of $ 393.1 million are stated net of inventory write-downs . if actual demand for our products deteriorates or market conditions are less favorable than those that we project , additional inventory write-downs may be required in the future . goodwill . goodwill represents the excess purchase price of an acquired enterprise or assets over the estimated fair value of identifiable net assets acquired . we assess goodwill for potential impairment at the reporting unit level during the third quarter of each year , or whenever events or circumstances indicate that the carrying value of these assets may exceed their fair value . we may assess qualitative factors to make this determination , or bypass such a qualitative assessment and proceed directly to testing goodwill for impairment using a two-step process . story_separator_special_tag earnings from operations increased by 14.5 percent primarily due to lower operating expenses and higher gross margins , partially offset by the decrease in revenues . during the year ended december 31 , 2015 , surveillance had restructuring charges of $ 0.2 million , compared to $ 5.2 million in 2014. revenue decreased by 6.2 percent in 2014 compared to 2013 , primarily due to the reductions in demand from united states government funded customers . earnings from operations decreased by 6.1 percent primarily due to the lower revenues , partially offset by cost savings generated as a result of restructuring activities . in 2013 , surveillance had restructuring charges of $ 5.4 million . instruments instruments operating results are as follows ( in millions , except percentages ) : replace_table_token_5_th instruments segment revenue for the year ended december 31 , 2015 decreased by 1.9 percent compared to the year ended december 31 , 2014 . the year over year decrease in revenue was primarily due to a revenue decline in the americas region , partially offset by an increase in the asia pacific region ; on a product line basis , declines in our higher end thermography and in our optical gas imaging product lines were partially offset by increases in our science , test and measurement , and fire product lines . revenues for the year ended december 31 , 2015 were also negatively impacted by year over year changes in currency exchange rates . on a constant currency basis , instruments revenues in 2015 increased by 4.9 percent compared to 2014. the increase in earnings from operations for the year ended december 31 , 2015 compared to the year ended december 31 , 2014 is primarily due to lower restructuring expenses and costs savings associated with restructuring activities . as a large portion of segment expenses are incurred in europe , the segment experienced a favorable impact on its operating expenses from the changes in foreign currency rates which largely offset the associated decline in revenues in that region . during the year ended december 31 , 2015 , instrument had restructuring charges of $ 1.2 million compared to $ 11.0 million in the year ended december 31 , 2014 . 38 instruments segment revenue for the year ended december 31 , 2014 increased by 4.9 percent , compared to the year ended december 31 , 2013 . the year over year increase in revenue is primarily due to increased deliveries in most geographic regions and across most product lines , particularly for products introduced late in 2013 and in 2014. the increase in earnings from operations for the year ended december 31 , 2014 compared to 2013 is primarily due to higher revenues , lower restructuring expenses and cost savings generated from those restructuring activities . during 2013 , the segment incurred restructuring charges of $ 15.5 million . security security operating results are as follows ( in millions , except percentages ) : replace_table_token_6_th security segment revenue for the year ended december 31 , 2015 increased by 26.5 percent over the year ended december 31 , 2014. the increase was primarily due to increased deliveries across all product families and in the americas and europe geographic regions . the increase of earnings from operations of 13.1 percent was primarily due to the increase in revenues , partially offset by increases in sales and marketing support operating expenses . security segment revenue for the year ended december 31 , 2014 increased by 27.0 percent compared to the prior year primarily due to increased deliveries in all product families and expanded distribution . the increase in earnings from operations in 2014 of 43.4 percent over 2013 was primarily due to the increase in year over year revenues , partially offset by increased marketing , customer technical support and product development expenses . the increase in backlog was primarily due to an increase in orders from international customers which often have longer delivery times . oem & emerging markets oem & emerging markets operating results are as follows ( in millions , except percentages ) : replace_table_token_7_th oem & emerging markets segment revenue decreased by 6.2 percent in 2015 compared to 2014 , primarily due to the loss of approximately $ 8.8 million in 2014 revenue from our former optical components group which was sold in august 2014 and the negative impacts of changes in currency exchange rates . earnings from operations declined in 2015 compared to 2014 primarily due to the decrease in revenue and lower gross margins , partially offset by lower operating expenses . revenue increased by 8.2 percent in 2014 compared to 2013 , primarily due to increased deliveries to customers in the united states , particularly of uncooled camera cores and newly introduced mobile accessories . earnings from operations increased by 28.0 percent due to the increase in revenues and cost savings from restructuring activities . 39 maritime maritime operating results are as follows ( in millions , except percentages ) : replace_table_token_8_th maritime segment revenue for the year ended december 31 , 2015 decreased by 7.6 percent compared to 2014 primarily due to the negative impact of year over year changes in currency exchange rates in the europe and asia pacific regions . on a constant currency basis , 2015 revenue increased by 2.2 percent compared to 2014. since the majority of the segment 's costs of goods sold are incurred in united states dollars , those costs did not receive the favorable impact of changes in currency exchange rates . consequently , the decrease in earnings from operations in 2015 compared to 2014 was primarily due to the revenue decline . maritime segment revenue for the year ended december 31 , 2014 increased by 1.9 percent compared to the same period of 2013 primarily due to higher deliveries in europe and year over year unit volume increases from raymarine-branded product lines . detection detection operating results are as follows ( in

liquidity and capital resources at december 31 , 2015 , we had a total of $ 472.8 million in cash and cash equivalents , $ 129.6 million of which was in the united states and $ 343.2 million at our foreign subsidiaries , compared to cash and cash equivalents at december 31 , 2014 of $ 531.4 million , of which $ 164.1 million was in the united states and $ 367.3 million at our foreign subsidiaries . we intend to indefinitely reinvest the cash at our foreign subsidiaries in operations and other activities outside the united states . the decrease in cash and cash equivalents in 2015 was primarily due to $ 123.2 million spent for the repurchase of our common stock , $ 92.3 million spent on the acquisition of dvtel , inc. , $ 68.2 million spent on capital expenditures and dividends paid of $ 61.4 million , partially offset by cash provided from operations of $ 275.8 million . cash provided by operating activities in 2015 totaled $ 275.8 million compared to $ 226.2 million in 2014 and $ 355.0 million in 2013 . the increase in cash provided from operations in 2015 compared to 2014 was primarily due to the increase in net earnings . the decrease in cash provided from operations in 2014 compared to 2013 was primarily related to lower net collections of accounts receivable . cash used for investing activities for the year ended december 31 , 2015 totaled $ 134.8 million , consisting of $ 92.3 million , net of cash acquired , for the acquisition of dvtel , inc. and capital expenditures of $ 68.2 million , partially offset by $ 25.6 million of proceeds from the sale of an investment in a third party .


 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 at december 31 , 2015 , we had a total of $ 472.8 million in cash and cash equivalents , $ 129.6 million of which was in the united states and $ 343.2 million at our foreign subsidiaries , compared to cash and cash equivalents at december 31 , 2014 of $ 531.4 million , of which $ 164.1 million was in the united states and $ 367.3 million at our foreign subsidiaries . we intend to indefinitely reinvest the cash at our foreign subsidiaries in operations and other activities outside the united states . the decrease in cash and cash equivalents in 2015 was primarily due to $ 123.2 million spent for the repurchase of our common stock , $ 92.3 million spent on the acquisition of dvtel , inc. , $ 68.2 million spent on capital expenditures and dividends paid of $ 61.4 million , partially offset by cash provided from operations of $ 275.8 million . cash provided by operating activities in 2015 totaled $ 275.8 million compared to $ 226.2 million in 2014 and $ 355.0 million in 2013 . the increase in cash provided from operations in 2015 compared to 2014 was primarily due to the increase in net earnings . the decrease in cash provided from operations in 2014 compared to 2013 was primarily related to lower net collections of accounts receivable . cash used for investing activities for the year ended december 31 , 2015 totaled $ 134.8 million , consisting of $ 92.3 million , net of cash acquired , for the acquisition of dvtel , inc. and capital expenditures of $ 68.2 million , partially offset by $ 25.6 million of proceeds from the sale of an investment in a third party .
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 Suspicious Activity Report : we evaluate our estimates , including those related to revenue recognition , allowance for doubtful accounts , inventories , goodwill , warranty obligations , contingencies and income taxes on an on-going basis . we base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances , the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources . actual results may differ from these estimates under different assumptions or conditions . senior management has discussed the development , selection and disclosure of these estimates with the audit committee of our board of directors . we believe the following critical accounting policies and the related judgments and estimates affect the preparation of our consolidated financial statements . 32 revenue recognition . revenue is recognized when persuasive evidence of an arrangement exists , upon delivery of the product to the customer at a fixed or determinable price with a reasonable assurance of collection , passage of title and risk of loss to the customer as indicated by the contractual terms and fulfillment of all significant obligations . we design , market and sell our products primarily as commercial , off-the-shelf products . certain customers request different system configurations , generally based on standard options or accessories that we offer . in general , our revenue arrangements do not involve acceptance provisions based upon customer specified acceptance criteria . in those circumstances when customer specified acceptance criteria exist , revenue is deferred until customer acceptance if we can not demonstrate that the system meets those specifications prior to shipment . for any contracts with multiple elements ( i.e . , training , installation , additional parts , etc . ) we allocate revenue among the deliverables primarily based upon objective and reliable evidence of fair value of each element in the arrangement . if objective and reliable evidence of fair value of any element is not available , we use an estimated selling price for purposes of allocating the total arrangement consideration among the elements . in addition , judgments are required in evaluating the credit worthiness of our customers . credit is not extended to customers and revenue is not recognized until we have determined that collectability is reasonably assured . allowance for doubtful accounts . our policy is to maintain allowances for estimated losses resulting from the inability of our customers to make required payments . credit limits are established through a process of reviewing the financial history and stability of each customer . where appropriate , we obtain credit rating reports and financial statements of the customer when determining or modifying their credit limits . we regularly evaluate the collectability of our trade receivable balances based on a combination of factors . when a customer 's account balance becomes past due , we initiate dialogue with the customer to determine the cause . if it is determined that the customer will be unable to meet its financial obligation to us , such as in the case of a bankruptcy filing , deterioration in the customer 's operating results or financial position or other material events impacting their business , we record a specific allowance to reduce the related receivable to the amount we expect to recover given all information presently available . actual write-offs during the past three years have not been material to our results of operations . we also record an allowance for all other customers based on certain other factors including the length of time the receivables are past due and historical collection experience with individual customers . as of december 31 , 2015 , our accounts receivable balance of $ 326.1 million is reported net of allowances for doubtful accounts of $ 6.9 million . we believe our reported allowances at december 31 , 2015 are adequate . if the financial conditions of those customers were to deteriorate , however , resulting in their inability to make payments , we may need to record additional allowances that would result in additional selling , general and administrative expenses being recorded for the period in which such determination is made . inventory . our policy is to record inventory write-downs when conditions exist that indicate that our inventories are likely to be in excess of anticipated demand or are obsolete based upon our assumptions about future demand for our products and market conditions . we regularly evaluate the ability to realize the value of our inventories based on a combination of factors including the following : historical usage rates , forecasted sales or usage , product end of life dates , estimated current and future market values and new product introductions . purchasing requirements and alternative usages are evaluated within these processes to mitigate inventory exposure . when recorded , our write-downs are intended to reduce the carrying value of our inventories to their net realizable value and establish a new cost basis . as of december 31 , 2015 , our inventories of $ 393.1 million are stated net of inventory write-downs . if actual demand for our products deteriorates or market conditions are less favorable than those that we project , additional inventory write-downs may be required in the future . goodwill . goodwill represents the excess purchase price of an acquired enterprise or assets over the estimated fair value of identifiable net assets acquired . we assess goodwill for potential impairment at the reporting unit level during the third quarter of each year , or whenever events or circumstances indicate that the carrying value of these assets may exceed their fair value . we may assess qualitative factors to make this determination , or bypass such a qualitative assessment and proceed directly to testing goodwill for impairment using a two-step process . story_separator_special_tag earnings from operations increased by 14.5 percent primarily due to lower operating expenses and higher gross margins , partially offset by the decrease in revenues . during the year ended december 31 , 2015 , surveillance had restructuring charges of $ 0.2 million , compared to $ 5.2 million in 2014. revenue decreased by 6.2 percent in 2014 compared to 2013 , primarily due to the reductions in demand from united states government funded customers . earnings from operations decreased by 6.1 percent primarily due to the lower revenues , partially offset by cost savings generated as a result of restructuring activities . in 2013 , surveillance had restructuring charges of $ 5.4 million . instruments instruments operating results are as follows ( in millions , except percentages ) : replace_table_token_5_th instruments segment revenue for the year ended december 31 , 2015 decreased by 1.9 percent compared to the year ended december 31 , 2014 . the year over year decrease in revenue was primarily due to a revenue decline in the americas region , partially offset by an increase in the asia pacific region ; on a product line basis , declines in our higher end thermography and in our optical gas imaging product lines were partially offset by increases in our science , test and measurement , and fire product lines . revenues for the year ended december 31 , 2015 were also negatively impacted by year over year changes in currency exchange rates . on a constant currency basis , instruments revenues in 2015 increased by 4.9 percent compared to 2014. the increase in earnings from operations for the year ended december 31 , 2015 compared to the year ended december 31 , 2014 is primarily due to lower restructuring expenses and costs savings associated with restructuring activities . as a large portion of segment expenses are incurred in europe , the segment experienced a favorable impact on its operating expenses from the changes in foreign currency rates which largely offset the associated decline in revenues in that region . during the year ended december 31 , 2015 , instrument had restructuring charges of $ 1.2 million compared to $ 11.0 million in the year ended december 31 , 2014 . 38 instruments segment revenue for the year ended december 31 , 2014 increased by 4.9 percent , compared to the year ended december 31 , 2013 . the year over year increase in revenue is primarily due to increased deliveries in most geographic regions and across most product lines , particularly for products introduced late in 2013 and in 2014. the increase in earnings from operations for the year ended december 31 , 2014 compared to 2013 is primarily due to higher revenues , lower restructuring expenses and cost savings generated from those restructuring activities . during 2013 , the segment incurred restructuring charges of $ 15.5 million . security security operating results are as follows ( in millions , except percentages ) : replace_table_token_6_th security segment revenue for the year ended december 31 , 2015 increased by 26.5 percent over the year ended december 31 , 2014. the increase was primarily due to increased deliveries across all product families and in the americas and europe geographic regions . the increase of earnings from operations of 13.1 percent was primarily due to the increase in revenues , partially offset by increases in sales and marketing support operating expenses . security segment revenue for the year ended december 31 , 2014 increased by 27.0 percent compared to the prior year primarily due to increased deliveries in all product families and expanded distribution . the increase in earnings from operations in 2014 of 43.4 percent over 2013 was primarily due to the increase in year over year revenues , partially offset by increased marketing , customer technical support and product development expenses . the increase in backlog was primarily due to an increase in orders from international customers which often have longer delivery times . oem & emerging markets oem & emerging markets operating results are as follows ( in millions , except percentages ) : replace_table_token_7_th oem & emerging markets segment revenue decreased by 6.2 percent in 2015 compared to 2014 , primarily due to the loss of approximately $ 8.8 million in 2014 revenue from our former optical components group which was sold in august 2014 and the negative impacts of changes in currency exchange rates . earnings from operations declined in 2015 compared to 2014 primarily due to the decrease in revenue and lower gross margins , partially offset by lower operating expenses . revenue increased by 8.2 percent in 2014 compared to 2013 , primarily due to increased deliveries to customers in the united states , particularly of uncooled camera cores and newly introduced mobile accessories . earnings from operations increased by 28.0 percent due to the increase in revenues and cost savings from restructuring activities . 39 maritime maritime operating results are as follows ( in millions , except percentages ) : replace_table_token_8_th maritime segment revenue for the year ended december 31 , 2015 decreased by 7.6 percent compared to 2014 primarily due to the negative impact of year over year changes in currency exchange rates in the europe and asia pacific regions . on a constant currency basis , 2015 revenue increased by 2.2 percent compared to 2014. since the majority of the segment 's costs of goods sold are incurred in united states dollars , those costs did not receive the favorable impact of changes in currency exchange rates . consequently , the decrease in earnings from operations in 2015 compared to 2014 was primarily due to the revenue decline . maritime segment revenue for the year ended december 31 , 2014 increased by 1.9 percent compared to the same period of 2013 primarily due to higher deliveries in europe and year over year unit volume increases from raymarine-branded product lines . detection detection operating results are as follows ( in

