Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax expense (benefit):
Federal	$ 1,339	$ 585	$ (15,424)
State	2,625	(51)	1,162
Total current tax expense (benefit)	3,964	534	(14,262)
Deferred income tax expense (benefit):
Federal	3,031	(7,868)	8,389
State	(1,564)	1,932	3,628
Total deferred tax expense (benefit)	1,467	(5,936)	12,017
Income tax expense (benefit)	$ 5,431	$ (5,402)	$ (2,245)