CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (16,858)	$ 27,051	$ 72,626	$ 26,889
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale securities		(2,005)		1,488
Reclassification of unrealized gain to realized gain on available-for-sale securities		(24,465)		(24,465)
Foreign currency translation adjustments	(8,774)	9,944	(2,659)	(8,538)
Total other comprehensive loss	(8,774)	(16,526)	(2,659)	(31,515)
Comprehensive income (loss)	$ (25,632)	$ 10,525	$ 69,967	$ (4,626)