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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Costs and Estimated Earnings on Uncompleted Contracts    
Costs incurred on uncompleted contracts $ 3,882,968 $ 2,977,535
Accrued loss provision for estimated losses on uncompleted contracts 764 917
Gross profit recognized 448,928 303,634
Costs and Estimated Earnings on Uncompleted Contracts 4,332,660 3,282,086
Less: billings to date (4,449,851) (3,377,949)
Net cost and estimated earnings in excess of billings (117,191) (95,863)
Amount included in consolidated balance sheet    
Costs and estimated earnings in excess of billings 41,701 41,866
Billings in excess of costs and estimated earnings (158,892) (137,729)
Net cost and estimated earnings in excess of billings $ (117,191) $ (95,863)