Income Taxes Income Taxes (Components of Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 32,042	$ 20,215	$ 16,713
State	3,868	1,869	1,124
Current income tax expense (benefit)	35,910	22,084	17,837
Deferred
Federal	160	1,797	(3,049)
State	1,106	521	(522)
Deferred income tax expense (benefit)	1,266	2,318	(3,571)
Income tax expense	$ 37,176	$ 24,402	$ 14,266