Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Class of Stock [Line Items]
Foreign Currency Translation Adjustment Income (Loss), Net, Beginning Balance	$ (22,312)	$ (7,225)
Foreign Currency Translation Adjustment Income (Loss), Net, Balance, Other comprehensive income (loss)	4,817	(16,649)
Foreign Currency Translation Adjustment Income (Loss), Net, Ending Balance	(17,495)	(23,874)
Unrealized Gain (Loss) on Marketable Securities, Net, Beginning Balance	(345)	(198)
Unrealized Gain (Loss) on Marketable Securities, Net, Other comprehensive income (loss)	918	356
Unrealized Gain (Loss) on Marketable Securities, Net, Ending Balance	573	158
Beginning Balance	(22,657)	(7,423)
Other comprehensive income (loss)	5,735	(16,293)
Ending Balance	$ (16,922)	$ (23,716)