UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 40,228	$ (93,337)	$ 43,534	$ (55,705)
Other comprehensive loss:
Unrealized gains on available-for-sale securities (net of taxes of $0, $18, $0, $159 respectively)	0	102	0	901
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $0, $4, $0, $508 respectively)	0	(23)	0	(2,880)
Foreign currency translation adjustments	(53,541)	(49,171)	(118,713)	(52,582)
Other comprehensive loss	(53,541)	(49,092)	(118,713)	(54,561)
Comprehensive loss	$ (13,313)	$ (142,429)	$ (75,179)	$ (110,266)