Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2017	$ 3,224,370
Other comprehensive gain	10,309	$ 12,661
Balance as of March 31, 2017	3,258,546
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2017	(59,017)
Other comprehensive gain	9,499
Balance as of March 31, 2017	(49,518)
Net Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2017	2,795
Other comprehensive gain	810
Balance as of March 31, 2017	3,605
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2017	(56,222)
Other comprehensive gain	10,309
Balance as of March 31, 2017	$ (45,913)