Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Loss [Roll Forward]
Balance as of January 1, 2014	$ (2,091)
Other comprehensive income (loss)	454	(3,943)
Balance as of March 31, 2014	(1,637)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss [Roll Forward]
Balance as of January 1, 2014	(6,715)
Other comprehensive income (loss)	1,367
Balance as of March 31, 2014	(5,348)
Net Unrealized Gain (Loss) on Investments
Accumulated Other Comprehensive Loss [Roll Forward]
Balance as of January 1, 2014	4,624
Other comprehensive income (loss)	(913)
Balance as of March 31, 2014	$ 3,711