Condensed Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income (loss)	$ 94,338	$ (183,757)	$ 306,564	$ 77,781
Other comprehensive income (loss), net of tax:
Foreign currency translation	488	(1,847)	2,609	(6,065)
Unrealized (losses) gains on marketable securities	(1,910)	135	1,553	389
Unrealized gains on pension obligation	15	8,932	1,225	1,487
Unrealized (losses) gains on hedging activities, net of tax of $(8,694), $(8,011), $(46,057) and $2,998, respectively	(15,904)	(15,308)	(84,305)	1,832
Other comprehensive (loss) income, net of tax	(17,311)	(8,088)	(78,918)	(2,357)
Comprehensive income (loss)	$ 77,027	$ (191,845)	$ 227,646	$ 75,424