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Accounts Payable and Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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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

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