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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 308,722 $ 193,814 $ 223,994
Other comprehensive income (loss), net of tax:      
Changes in net prior service credit and net actuarial losses, net of tax benefit (provision) of $11,007, $(2,540) and $16,248, respectively (29,502) 15,364 (49,644)
Change in fair value of derivatives, net of tax benefit of $461, $683 and $283, respectively (1,474) (2,174) (919)
Foreign currency translation, net of tax benefit (provision) of $15,692, $(1,559) and $(3,914), respectively 29,765 (4,124) (29,272)
Other comprehensive (loss) income (1,211) 9,066 (79,835)
Comprehensive income $ 307,511 $ 202,880 $ 144,159