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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 593,794	$ 20,311	$ 521,503
Other comprehensive (loss) income:
Foreign currency translation	(36,279)	101,148	(66,996)
Unrealized gains (losses) on investments before income taxes	698	(1,794)	279
Income tax benefit	443	68	111
Unrealized gains (losses) on investments, net of tax	1,141	(1,726)	390
Retirement liability adjustment before reclassifications	(6,722)	7,832	(6,783)
Amounts reclassified to other expense	48,792	3,948	3,263
Retirement liability adjustment before income taxes	42,070	11,780	(3,520)
Income tax (expense) benefit	(14,836)	(4,989)	572
Retirement liability adjustment, net of tax	27,234	6,791	(2,948)
Other comprehensive (loss) income	(7,904)	106,213	(69,554)
Comprehensive income	$ 585,890	$ 126,524	$ 451,949

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