Income Tax Expense (Components of Net Loss and Income Tax (Benefit) Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract]
United States	$ (135,925)	$ (44,114)	$ (9,799)
Foreign	(18,254)	(15,647)	(22,681)
Net loss before income tax	(154,179)	(59,761)	(32,480)
Current:
Federal	(50)	50	(20)
State	90	100	181
Foreign	458	148	24
Total current	498	298	185
Deferred:
Federal	0	(8,621)	(10)
State	0	(1,008)	0
Foreign	0	(6)	(237)
Total deferred	0	(9,635)	(247)
Total:
Federal	(50)	(8,571)	(30)
State	90	(908)	181
Foreign	458	142	(213)
Income tax expense (benefit)	$ 498	$ (9,337)	$ (62)