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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts Payable and Accrued Liabilities    
Retention amounts included in accounts payable $ 8,303 $ 9,285
Accrued expenses and other current liabilities    
Payroll and related employee benefits 48,634 37,261
Insurance, including self-insurance reserves 45,420 34,377
Reserve for estimated losses on uncompleted contracts 4,957 2,363
Corporate income taxes and other taxes 9,296 3,775
Accrued overhead cost 954 1,059
Other 4,328 4,566
Total accrued expenses and other current liabilities $ 113,589 $ 83,401