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Benefit Plans - Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Plan Disclosure [Line Items] |  |
Noncurrent liabilities | $ 121,597 | $ 108,044
Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current liabilities | 2,760 | 1,899
Noncurrent liabilities | 105,207 | 92,820
Liabilities | 107,967 | 94,719
Other Postretirement Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current liabilities | 133 | 96
Noncurrent liabilities | 16,182 | 15,224
Liabilities | $ 16,315 | $ 15,320

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