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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

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