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Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2017
Payables And Accruals [Abstract] |
Summary of Accrued Expenses | Accrued expenses consisted of the following at December 31, 2017 and 2016 (in thousands):
|  | 2017 |  |  | 2016 |
Salaries, wages, payroll taxes and benefits |  | $ | 50,443 |  |  | $ | 21,138 |
Workers’ compensation liability |  |  | 80,751 |  |  |  | 67,775 |
Property, sales, use and other taxes |  |  | 29,332 |  |  |  | 6,766 |
Insurance, other than workers’ compensation |  |  | 10,816 |  |  |  | 9,566 |
Accrued interest payable |  |  | 7,558 |  |  |  | 6,740 |
Accrued merger and integration |  |  | 16,101 |  |  |  | — |
Other |  |  | 31,628 |  |  |  | 27,163 |
|  | $ | 226,629 |  |  | $ | 139,148 |

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