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Unaudited Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Unaudited Quarterly Financial Data |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,201,877 us-gaap_ContractsRevenue | $ 1,250,689 us-gaap_ContractsRevenue | $ 1,084,510 us-gaap_ContractsRevenue | $ 955,233 us-gaap_ContractsRevenue | $ 1,099,291 us-gaap_ContractsRevenue | $ 1,030,388 us-gaap_ContractsRevenue | $ 1,053,065 us-gaap_ContractsRevenue | $ 992,928 us-gaap_ContractsRevenue | $ 4,492,309 us-gaap_ContractsRevenue | $ 4,175,672 us-gaap_ContractsRevenue | $ 4,111,471 us-gaap_ContractsRevenue
Gross profit | 129,723 us-gaap_GrossProfit | 140,841 us-gaap_GrossProfit | 129,531 us-gaap_GrossProfit | 105,347 us-gaap_GrossProfit | 139,735 us-gaap_GrossProfit | 120,857 us-gaap_GrossProfit | 105,955 us-gaap_GrossProfit | 100,357 us-gaap_GrossProfit | 505,442 us-gaap_GrossProfit | 466,904 us-gaap_GrossProfit | 415,132 us-gaap_GrossProfit
Income from construction operations | 64,396 us-gaap_OperatingIncomeLoss | 70,354 us-gaap_OperatingIncomeLoss | 65,443 us-gaap_OperatingIncomeLoss | 41,497 us-gaap_OperatingIncomeLoss | 70,175 us-gaap_OperatingIncomeLoss | 58,094 us-gaap_OperatingIncomeLoss | 39,474 us-gaap_OperatingIncomeLoss | 36,079 us-gaap_OperatingIncomeLoss | 241,690 us-gaap_OperatingIncomeLoss | 203,822 us-gaap_OperatingIncomeLoss | (221,811)us-gaap_OperatingIncomeLoss
Income before income taxes | 53,917 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 58,616 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 47,612 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 27,293 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 53,507 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 37,035 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 25,157 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 23,916 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 187,438 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 139,615 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (267,842)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Net income (loss) | $ 27,722 us-gaap_NetIncomeLoss | $ 35,730 us-gaap_NetIncomeLoss | $ 28,545 us-gaap_NetIncomeLoss | $ 15,939 us-gaap_NetIncomeLoss | $ 33,259 us-gaap_NetIncomeLoss | $ 23,759 us-gaap_NetIncomeLoss | $ 15,478 us-gaap_NetIncomeLoss | $ 14,800 us-gaap_NetIncomeLoss | $ 107,936 us-gaap_NetIncomeLoss | $ 87,296 us-gaap_NetIncomeLoss | $ (265,400)us-gaap_NetIncomeLoss
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.57 us-gaap_EarningsPerShareBasic | $ 0.74 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ 0.33 us-gaap_EarningsPerShareBasic | $ 0.69 us-gaap_EarningsPerShareBasic | $ 0.50 us-gaap_EarningsPerShareBasic | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 2.22 us-gaap_EarningsPerShareBasic | $ 1.82 us-gaap_EarningsPerShareBasic | $ (5.59)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 0.56 us-gaap_EarningsPerShareDiluted | $ 0.73 us-gaap_EarningsPerShareDiluted | $ 0.58 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ 0.68 us-gaap_EarningsPerShareDiluted | $ 0.49 us-gaap_EarningsPerShareDiluted | $ 0.32 us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 2.20 us-gaap_EarningsPerShareDiluted | $ 1.80 us-gaap_EarningsPerShareDiluted | $ (5.59)us-gaap_EarningsPerShareDiluted

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- Definition Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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