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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Accounts Payable and Accrued Liabilities    
Retention amounts included in accounts payable $ 7,193 $ 5,602
Accrued expenses and other current liabilities    
Payroll and related employee benefits 41,909 36,556
Insurance, including self-insurance reserves 34,198 33,880
Reserve for estimated losses on uncompleted contracts 140 1,392
Corporate income taxes and other taxes 11,326 13,305
Accrued overhead cost 1,046 1,165
Other 4,639 4,781
Total accrued expenses and other current liabilities $ 93,258 $ 91,079