Income Taxes (Components of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
U.S. Federal	$ 29,832	$ 33,379	$ 27,962
State	12,618	10,632	11,225
Current Total	42,450	44,011	39,187
Deferred:
U.S. Federal	(783)	(7,209)	(12,524)
State	110	(3,989)	(5,111)
Deferred Total	(673)	(11,198)	(17,635)
Income tax expense	$ 41,777	$ 32,813	$ 21,552