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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income $ 784,147 $ 467,468 $ 451,779
Other comprehensive income, net of tax:      
Foreign currency translation adjustment, net of tax of $0, $0, $0 48,903 (10,991) (28,442)
Available-for-sale marketable securities:      
Unrealized gains (losses) on marketable securities arising during period, net of tax of $1,629, $1,659, $(722), respectively 5,839 6,015 (2,110)
Less: Reclassification adjustment for (gains) losses included in net income, net of tax of $(665), $(192), $(21), respectively (2,365) (690) 1,337
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total 3,474 5,325 (773)
Defined benefit pension and post-retirement plans:      
Amortization of prior service benefit included in net periodic pension and post-retirement benefit, net of tax $(2), $(43), $(71), respectively (7) (148) (245)
Other comprehensive income (loss) 52,370 (5,814) (29,460)
Comprehensive income $ 836,517 $ 461,654 $ 422,319