Income Taxes (Components of Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 0	$ (23,500)	$ 10,931
State, local, and foreign	1,875	660	3,627
Deferred:
Federal	(27,118)	(39,695)	1,874
State, local, and foreign	52	(3,746)	880
Total	$ (25,191)	$ (66,281)	$ 17,312