Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (43,308)	$ (4,446)
Other comprehensive (loss) income before reclassifications	(5,154)	(38,658)
Amounts reclassified from accumulated other comprehensive (loss) income	(103)	(204)
Net decrease in other comprehensive (loss) income	(5,257)	(38,862)
Ending balance	(48,565)	(43,308)
Foreign currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(42,502)	(4,615)
Other comprehensive (loss) income before reclassifications	(5,464)	(37,887)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0
Net decrease in other comprehensive (loss) income	(5,464)	(37,887)
Ending balance	(47,966)	(42,502)
Change in unrealized gains on available for sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(806)	169
Other comprehensive (loss) income before reclassifications	310	(771)
Amounts reclassified from accumulated other comprehensive (loss) income	(103)	(204)
Net decrease in other comprehensive (loss) income	207	(975)
Ending balance	$ (599)	$ (806)