Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Tax provisions (benefit)	$ 475	$ (37,429)	$ 906	$ (38,746)
Pretax losses	$ 3,499	$ (129,425)	$ 1,508	$ (133,574)
Effective income tax rate, Percent	13.60%	28.90%	60.10%	29.00%