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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 $ 521,571 $ 592,198 $ 593,794
Other comprehensive income (loss):      
Foreign currency translation 5,984 1,631 (36,279)
Unrealized gains on investments before income taxes   3,046 698
Income tax (expense) benefit   (641) 443
Unrealized gains on investments, net of tax   2,405 1,141
Retirement liability adjustment before reclassifications (6,786) (9,360) (6,722)
Amounts reclassified to other expense 1,389 1,979 48,792
Retirement liability adjustment before income taxes (5,397) (7,381) 42,070
Income tax benefit (expense) 941 1,845 (14,836)
Retirement liability adjustment, net of tax (4,456) (5,536) 27,234
Other comprehensive income (loss) 1,528 (1,500) (7,904)
Comprehensive income $ 523,099 $ 590,698 $ 585,890