Income Taxes - Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax expense:
Federal	$ 12,730	$ 15,060	$ 16,677
State	5,454	3,244	3,829
Deferred tax expense	989	12,505	2,676
Total Income tax expense	$ 19,173	$ 30,809	$ 23,182