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Accrued Liabilities - Schedule of other current liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities    
Payroll and incentive compensation $ 22,645 $ 21,641
Union dues and benefits 18,747 11,465
Taxes 6,790 7,999
Profit sharing and thrift plan 5,325 1,215
Net asset adjustments 987 11,210
Joint venture liability 652 0
Other 9,218 7,828
Total other current liabilities $ 64,364 $ 61,358