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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 592,198	$ 593,794	$ 20,311
Other comprehensive (loss) income:
Foreign currency translation	1,631	(36,279)	101,148
Unrealized gains (losses) on investments before income taxes	3,046	698	(1,794)
Income tax (expense) benefit	(641)	443	68
Unrealized gains (losses) on investments, net of tax	2,405	1,141	(1,726)
Retirement liability adjustment before reclassifications	(9,360)	(6,722)	7,832
Amounts reclassified to other expense	1,979	48,792	3,948
Retirement liability adjustment before income taxes	(7,381)	42,070	11,780
Income tax benefit (expense)	1,845	(14,836)	(4,989)
Retirement liability adjustment, net of tax	(5,536)	27,234	6,791
Other comprehensive (loss) income	(1,500)	(7,904)	106,213
Comprehensive income	$ 590,698	$ 585,890	$ 126,524

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