Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Expected tax expense (benefit)									$ (48,693)	$ (67,452)	$ (17,263)
Valuation allowance									38,324	20,329	496
State income taxes									(3,033)	(2,066)	1,214
Incentive stock options									97	83	(208)
Other, net									(215)	155	(119)
Income tax expense (benefit)	$ (5,086)	$ (1,698)	$ (1,990)	$ (1,958)	$ (23,861)	$ (6,682)	$ (2,586)	$ (4,450)	(10,732)	(37,579)	(11,304)
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Foreign currency translation gain (loss)									838	8,660	2,699
Net tax benefits and nondeductible expenses in foreign jurisdictions									407	2,135	1,128
Effects of change in tax laws									516	0	(171)
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Nondeductible expenses for tax purposes									386	577	920
Expiration of capital loss									$ 641	$ 0	$ 0