Income Taxes (Components of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
U.S. Federal	$ 33,379	$ 27,962	$ 28,271
State	10,632	11,225	3,458
Current Total	44,011	39,187	31,729
Deferred:
U.S. Federal	(7,209)	(12,524)	(31,049)
State	(3,989)	(5,111)	(2,262)
Deferred Total	(11,198)	(17,635)	(33,311)
Income tax expense (benefit)	$ 32,813	$ 21,552	$ (1,582)