Income Taxes Income Taxes (Components of Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal	$ 16,713	$ (4,202)	$ 3,765
State	1,124	405	1,150
Current income tax expense (benefit)	17,837	(3,797)	4,915
Deferred
Federal	(3,049)	(4,176)	(69,281)
State	(522)	(1,716)	(1,211)
Deferred income tax expense (benefit)	(3,571)	(5,892)	(70,492)
Income tax expense	$ 14,266	$ (9,689)	$ (65,577)