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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Insurance $ 15,303 $ 13,724
Payroll and employee benefits 9,760 15,298
Contract reserves 6,142 1,709
Interest 3,282 3,448
Income and other taxes 1,082 1,175
Fuel hedge contracts 678 4,710
Other 7,590 8,287
Total accrued expenses $ 43,837 $ 48,351