Income Taxes - Components of Income Before Taxes and of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
United States	$ 16,990	$ 88,182
Foreign	346	699
Income before income taxes	17,336	88,881
Federal
Current	0	0
Deferred	6,251	20,205
Total	6,251	20,205
State
Current	(88)	722
Deferred	702	869
Total	614	1,591
Foreign
Current	723	163
Deferred	0	0
Total	723	163
Total
Current	635	885
Deferred	6,953	21,074
Effective income tax expense	7,588	21,959
Reconciliation of the federal income tax expense at the statutory rate to the effective income tax expense
Statutory federal income tax expense	3,640	18,665
State taxes, net of federal benefit	633	1,440
Foreign tax paid	0	0
Foreign jurisdiction rate differential	508	475
Permanent differences-nondeductible executive compensation	2,748	2,083
Permanent differences and other	59	(704)
Effective income tax expense	$ 7,588	$ 21,959