Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Tax provisions (benefit)	$ (208)	$ (3,379)	$ 698	$ (42,125)
Pretax losses	$ 3,014	$ (9,361)	$ 4,522	$ (142,935)
Effective income tax rate, Percent	(6.90%)	36.10%	15.40%	29.50%