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Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss
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)

The amortization of actuarial losses and periodic service credits associated with our retirement-related benefit plans is primarily included in Other, net in the consolidated statements of operations. On March 11, 2021, the American Rescue Plan Act ("ARPA") of 2021 was signed into law, which modified funding requirements for single-employer defined benefit pension plans by restarting and extending the amortization of funding shortfalls and extending and enhancing interest rate stabilization percentages. We have elected to use excess contributions resulting from a reduction to past contribution requirements allowed by ARPA to offset remaining required contributions. As of June 30, 2023, we have not contributed to our defined benefit pension plan in 2023. Based on current assumptions, we expect to make a contribution of up to $13 million in 2023 to our defined benefit pension plan. See Note 9. Derivatives, for information on the income statement line items affected as the result of reclassification adjustments associated with derivatives.