Accumulated Other Comprehensive Income or Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income [Abstract]
Net unrealized gain on available-for-sale investments				$ 5,065	$ 4,773
Foreign currency translation				(104)	(56)
Accumulated other comprehensive income	$ 4,717	$ 232	$ (2,014)	4,961	4,717
Deferred Tax Liabilities, Other Comprehensive Income				$ 2,800	$ 2,600
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance - January 1	4,717	232	(2,014)
Unrealized gain reclassified and recognized in net loss, net of tax	(481)	(3,020)	$ (764)
Foreign exchange reclassified and recognized in net loss, net of tax	361	6,567
Total reclassified and recognized in net loss, net of tax	(120)	3,547	$ (764)
Unrealized gain on marketable securities, net of tax	773	927	3,175
Accumulated currency, net of tax	(409)	11	(165)
Total other comprehensive loss, net of tax	244	4,485	2,246
Accumulated other comprehensive income	$ 4,961	4,717	$ 232
Translation loss		9,300
Tax benefit		$ 3,100