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Description of Business and Summary of Significant Accounting Policies (Costs And Estimated Earnings In Excess Of Billings) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Description of Business and Summary of Significant Accounting Policies [Abstract]    
Unbilled costs and profits incurred to date $ 253,078us-gaap_UnbilledContractsReceivable $ 204,276us-gaap_UnbilledContractsReceivable
Unapproved change orders 161,375us-gaap_UnapprovedChangeOrdersAmount 146,787us-gaap_UnapprovedChangeOrdersAmount
Claims 311,949us-gaap_ContractsReceivableClaimsAndUncertainAmounts 222,185us-gaap_ContractsReceivableClaimsAndUncertainAmounts
Costs and estimated earnings in excess of billings $ 726,402us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms $ 573,248us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms