CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 3,030	$ (2,056)	$ (66,453)
Other comprehensive income (loss):
Foreign currency translation adjustments	(1,528)	(2,381)	(529)
Change in unrealized (loss) gain on available for sale securities	(56,359)	(228)	25
Change in fair value of derivatives qualifying as cash flow hedges	597	424	458
Other comprehensive loss before income tax expense	(57,290)	(2,185)	(46)
Income tax expense related to items in other comprehensive loss	(297)	(78)	(188)
Total other comprehensive income (loss)	(57,587)	(2,263)	(234)
Comprehensive loss	(54,557)	(4,319)	(66,687)
Less: Comprehensive income attributable to non-controlling interests	(146)	(170)	0
Comprehensive loss, net	$ (54,703)	$ (4,489)	$ (66,687)