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Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts Payable and Accrued Liabilities |  |
Retention amounts included in accounts payable | $ 7,322 | $ 9,285
Accrued expenses and other current liabilities |  |
Payroll and related employee benefits | 36,616 | 37,261
Insurance, including self-insurance reserves | 36,205 | 34,377
Reserve for estimated losses on uncompleted contracts | 5,245 | 2,363
Corporate income taxes and other taxes | 2,116 | 3,775
Accrued overhead cost | 1,325 | 1,059
Other | 4,453 | 4,566
Total accrued expenses and other current liabilities | $ 85,960 | $ 83,401

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