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Accounts Payable and Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounts Payable and Accrued Liabilities |
Summary of accrued expenses and other current liabilities | The following is a summary of accrued expenses and other current liabilities at December 31 (in thousands):
|  | 2017 |  | 2016
Payroll and related employee benefits |  | $ | 45,708 |  | $ | 43,768
Insurance, including self-insurance reserves |  |  | 47,256 |  |  | 42,546
Reserve for estimated losses on uncompleted contracts |  |  | 10,067 |  |  | 12,801
Corporate income taxes and other taxes |  |  | 2,843 |  |  | 3,368
Other |  |  | 5,513 |  |  | 5,523
|  | $ | 111,387 |  | $ | 108,006

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