UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (93,337)	$ 35,361	$ (55,705)	$ 68,765
Other comprehensive (loss) income:
Unrealized gains on available-for-sale securities (net of taxes of $18, $153, $159 and $61 respectively)	102	1,074	901	359
Reclassification adjustment for gains on available-for-sale securities included in net (loss) income (net of taxes of $4, $0, $508 and $0 respectively)	(23)	0	(2,880)	0
Foreign currency translation adjustments	(49,171)	20,731	(52,582)	(37,921)
Other comprehensive (loss) income	(49,092)	21,805	(54,561)	(37,562)
Comprehensive (loss) income	$ (142,429)	$ 57,166	$ (110,266)	$ 31,203