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Accrued Liabilities - (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Other Current Liabilities [Line Items] |  |
Payroll and incentive compensation | $ 21,641 | $ 9,146
Net asset adjustments | 11,210 | 0
Union dues and benefits | 11,465 | 12,494
Profit sharing and thrift plan | 1,215 | 443
Taxes, other than income taxes | 7,999 | 6,807
Other | 7,828 | 4,843
Other current liabilities, total | $ 61,358 | $ 33,733

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