Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities    
Salaries, wages, and commissions $ 32,154 $ 34,085
Insurance liabilities 22,506 25,212
Deferred revenue 16,139 19,963
Interest payable on long-term debt 3,966 3,951
Other 23,653 21,025
Total accrued liabilities $ 98,418 $ 104,236