Income Taxes - Components of Income Before Taxes and of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ 88,182	$ 55,117
Foreign	699	1,157
Income before income taxes	88,881	56,274
Federal
Current	0	0
Deferred	20,205	12,871
Total	20,205	12,871
State
Current	722	364
Deferred	869	(814)
Total	1,591	(450)
Foreign
Current	163	622
Deferred	0	0
Total	163	622
Total
Current	885	986
Deferred	21,074	12,057
Income tax expense	21,959	13,043
Reconciliation of the federal income tax expense at the statutory rate to the effective income tax expense
Statutory federal income tax expense	18,665	11,818
State taxes, net of federal benefit	1,440	(526)
Foreign tax paid	0	622
Change in federal tax rate	475	0
Permanent differences-nondeductible executive compensation	2,083	1,144
Permanent differences and other	(704)	(15)
Effective income tax expense	$ 21,959	$ 13,043