Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 441	$ 196	$ 0
State	713	90	16
Foreign	613	367	308
Total current provision	1,767	653	324
Deferred:
Federal	0	0	(10)
State	(289)	1	(1)
Foreign	(6,338)	(5,215)	(141)
Total deferred benefit	(6,627)	(5,214)	(152)
Total provision (benefit) for income taxes	$ (4,860)	$ (4,561)	$ 172