Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (38,120)	$ (4,446)
Other comprehensive (loss) income before reclassifications	243	(33,254)
Amounts reclassified from accumulated other comprehensive income	(13)	(190)
Net increase (decrease) in other comprehensive (loss) income	230	(33,444)
Ending balance	(37,890)	(37,890)
Foreign currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(38,545)	(4,615)
Other comprehensive (loss) income before reclassifications	302	(33,628)
Amounts reclassified from accumulated other comprehensive income	0	0
Net increase (decrease) in other comprehensive (loss) income	302	(33,628)
Ending balance	(38,243)	(38,243)
Change in unrealized gains on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	425	169
Other comprehensive (loss) income before reclassifications	(59)	374
Amounts reclassified from accumulated other comprehensive income	(13)	(190)
Net increase (decrease) in other comprehensive (loss) income	(72)	184
Ending balance	$ 353	$ 353