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Accumulated Other Comprehensive Loss (Tables)
3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss, Net of Related Deferred Income Taxes
As of March 31, 2020 and December 31, 2019, the components of accumulated other comprehensive loss, net of related deferred income taxes, are as follows (in thousands):
 March 31, 2020December 31, 2019
Defined benefit pension and other post-retirement benefit plans $(138,263) $(143,389) 
Unrealized foreign currency translation gain1,842  4,289  
Unrealized loss on foreign currency forward contracts and interest rate swaps(32,188) (10,206) 
Total accumulated other comprehensive loss, net of tax $(168,609) $(149,306)