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Supplemental Balance Sheet Information - Uncompleted Contracts (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Supplemental Balance Sheet Data [Abstract]    
Costs incurred on uncompleted contracts $ 818,008 $ 795,139
Estimated earnings to date 159,321 158,982
Subtotal 977,329 954,121
Less – billings to date (975,663) (903,098)
Total 1,666 51,023
Costs and estimated earnings in excess of billings 89,141 94,045
Billings in excess of costs and estimated earnings (87,475) (43,022)
Total $ 1,666 $ 51,023