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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Payable and Accrued Liabilities    
Retention amounts included in accounts payable $ 15,946 $ 13,980
Accrued expenses and other current liabilities    
Payroll and related employee benefits 33,086 29,110
Insurance, including self-insurance reserves 22,982 18,732
Reserve for estimated losses on uncompleted contracts 764 917
Corporate income taxes and other taxes 3,779 1,546
Accrued overhead cost 2,007 1,819
Current liabilities of discontinued operations 133 733
Other 13,401 7,066
Total accrued expenses and other current liabilities $ 76,152 $ 59,923