Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (34,401)	$ (43,308)
Other comprehensive income (loss) before reclassifications	(3,810)	5,097
Net decrease in other comprehensive income (loss)	(3,810)	5,097
Ending balance	(38,211)	(38,211)
Foreign currency
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(34,960)	(42,502)
Other comprehensive income (loss) before reclassifications	(4,446)	3,096
Net decrease in other comprehensive income (loss)	(4,446)	3,096
Ending balance	(39,406)	(39,406)
Change in unrealized gains on available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	559	(806)
Other comprehensive income (loss) before reclassifications	636	2,001
Net decrease in other comprehensive income (loss)	636	2,001
Ending balance	$ 1,195	$ 1,195