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Accumulated Other Comprehensive Loss (Tables)
6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss, Net of Deferred Income Taxes
As of June 30, 2023 and December 31, 2022, the components of accumulated other comprehensive loss, net of related deferred income taxes, are as follows (in thousands):
 June 30, 2023December 31, 2022
Defined benefit pension and other postretirement benefit plans$(73,311)$(73,746)
Unrealized foreign currency translation gain9,115 5,257 
Unrealized gain on interest rate swaps3,046 4,577 
Share of other comprehensive loss of equity method investments(2,157)(1,819)
Total accumulated other comprehensive loss, net of tax $(63,307)$(65,731)