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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss
The balances of, and changes in, the components of accumulated other comprehensive loss, net of tax, consist of the following:
(in thousands)Pension Plans
and Other Postretirement Benefits		Foreign Currency Translation AdjustmentsAccumulated Other
Comprehensive (Loss) Income
Balance at December 31, 2017$(63,520)$(82,474)$(145,994)
Other comprehensive income (loss) before reclassifications
(25,027)(12,287)(37,314)
Amounts reclassified from accumulated other comprehensive loss (a)
1,992 0 1,992 
Other comprehensive income (loss) (23,035)(12,287)(35,322)
Balance at December 31, 2018(86,555)(94,761)(181,316)
Other comprehensive income (loss) before reclassifications
15,983 1,808 17,791 
Amounts reclassified from accumulated other comprehensive loss (a)
777 0 777 
Other comprehensive income (loss)16,760 1,808 18,568 
Balance at December 31, 2019(69,795)(92,953)(162,748)
Other comprehensive income (loss) before reclassifications
(25,490)12,560 (12,930)
Amounts reclassified from accumulated other comprehensive loss (a)
2,514 0 2,514 
Other comprehensive income (loss) (22,976)12,560 (10,416)
Balance at December 31, 2020$(92,771)$(80,393)$(173,164)
(a) The pension plan and other postretirement benefit components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost (income). See Note 17 for further information.