Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 69,134	$ 25,025	$ (8,819)
Net other comprehensive (loss) income	(42,184)	26,564	(103,707)
Ending balance	42,069	69,134	25,025
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(22,312)	(7,225)	10,815
Net other comprehensive (loss) income	(1,024)	(15,087)	(18,040)
Ending balance	(23,336)	(22,312)	(7,225)
Unrealized gain (loss) on marketable securities, net
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(345)	(198)	0
Net other comprehensive (loss) income	116	(147)	(198)
Ending balance	(229)	(345)	(198)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(22,657)	(7,423)	10,815
Ending balance	$ (23,565)	$ (22,657)	$ (7,423)