Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Equity [Abstract]
Deferred income tax liability	$ 500		$ 500		$ 3,600
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	6,087	$ 5,010	6,661	$ 4,961	4,961
Unrealized gain reclassified and recognized in net loss, net of tax	(5,485)	(83)	(5,966)	(86)
Foreign exchange reclassified and recognized in net loss, net of tax	(2)		2
Total reclassified and recognized in net income or loss, net of tax	(5,487)	(83)	(5,964)	(86)
Unrealized gain on marketable securities, net of tax	175	573	67	616
Accumulated currency, net of tax	12	17	23	26
Total other comprehensive income (loss), net of tax	(5,300)	507	(5,874)	556
Accumulated other comprehensive income	$ 787	$ 5,517	$ 787	$ 5,517	$ 6,661