Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2015	$ (17,611)
Other comprehensive (loss) income	(6,302)	454
Balance as of March 31, 2015	(23,913)
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	(8,415)
Balance as of March 31, 2015	(30,479)
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	2,113
Balance as of March 31, 2015	$ 6,566