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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 20,311	$ 521,503	$ 469,053
Foreign currency translation	101,148	(66,996)	(70,481)
Unrealized (losses) gains on investments before income taxes	(1,794)	279	(1,825)
Income tax benefit on unrealized (losses) gains on investments	68	111	31
Unrealized (losses) gains on investments, net of tax	(1,726)	390	(1,794)
Retirement liability adjustment before reclassifications	7,832	(6,783)	191
Retirement liability amounts reclassified to selling and administrative expenses	3,948	3,263	4,443
Retirement liability adjustment before income taxes	11,780	(3,520)	4,634
Income tax (expense) benefit on retirement liability adjustment	(4,989)	572	(380)
Retirement liability adjustment, net of tax	6,791	(2,948)	4,254
Other comprehensive income (loss)	106,213	(69,554)	(68,021)
Comprehensive income	$ 126,524	$ 451,949	$ 401,032

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