Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2015			$ (17,611)
Other comprehensive (loss) income	$ (466)	$ 4,133	(6,768)	$ 4,588
Balance as of June 30, 2015	(24,379)		(24,379)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2015			(22,064)
Other comprehensive (loss) income			(7,808)
Balance as of June 30, 2015	(29,872)		(29,872)
Net Unrealized Gain on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2015			4,453
Other comprehensive (loss) income			1,040
Balance as of June 30, 2015	$ 5,493		$ 5,493