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Benefit Plans - Amounts Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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