UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 10,395	$ 28,672	$ 3,306	$ 37,632
Other comprehensive income (loss):
Unrealized (losses) gains on available-for-sale securities (net of taxes of $0, $11, $0, $141 respectively)	0	(61)	0	799
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $0, $8, $0, $504 respectively)	0	(45)	0	(2,857)
Foreign currency translation adjustments	12,231	36,162	(65,172)	(3,411)
Other comprehensive income (loss)	12,231	36,056	(65,172)	(5,469)
Comprehensive income (loss)	$ 22,626	$ 64,728	$ (61,866)	$ 32,163