Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (17,528)	$ 15,533	$ (48,523)	$ 3,554
Other comprehensive income (loss), net of tax:
Change in foreign currency translation and other comprehensive income (loss)	10,495	(4,432)	13,088	2,510
Available for sale investments:
Change in unrealized loss, net of tax	(206)	(1,889)	(743)	(3,404)
Less: reclassification adjustments for losses included in net loss, net of tax	594	0	594	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (6,645)	$ 9,212	$ (35,584)	$ 2,660