Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current taxes [Abstract]
Federal	$ 526	$ 3,051	$ 29
State	881	830	1,857
Deferred taxes [Abstract]
Federal	14,114	11,853	20,136
State	2,009	4,559	5,024
Total	$ 17,530	$ 20,293	$ 27,046