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Accrued Liabilities - Schedule of Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Payables and Accruals [Abstract] |  |
Payroll and incentive compensation | $ 30,145 | $ 22,645
Union dues and benefits | 17,800 | 18,747
Taxes | 18,130 | 6,790
Profit sharing and thrift plan | 10,763 | 5,325
Net asset adjustments | 0 | 987
Joint venture liability | 0 | 652
Other | 9,880 | 9,218
Total other current liabilities | $ 86,718 | $ 64,364

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