Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in accumulated other comprehensive loss
Balance as of January 1, 2015	$ (17,611)
Other comprehensive loss	(23,842)	$ (15,520)	$ (451)
Balance as of December 31, 2015	(41,453)	(17,611)
Foreign Currency Translation
Changes in accumulated other comprehensive loss
Balance as of January 1, 2015	(22,064)
Other comprehensive loss	(22,872)
Balance as of December 31, 2015	(44,936)	(22,064)
Net Unrealized Gains (Losses) on Investments
Changes in accumulated other comprehensive loss
Balance as of January 1, 2015	4,453
Other comprehensive loss	(970)
Balance as of December 31, 2015	$ 3,483	$ 4,453