Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Deferred compensation	$ 4,498	$ 5,475
Loss and credit carryforwards	1,454	522
Accruals deductible for tax purposes when paid	908	1,551
State taxes	639	836
Depreciation	42	52
Unrealized gain	74	12
Leases	5,691	5,686
Other	13	88
Gross deferred tax assets	13,319	14,222
Deferred tax asset valuation allowance	(2,128)	(7,664)	$ (5,695)	$ (5,590)
Gross deferred tax assets less valuation allowance	11,191	6,558
Liabilities
Amortization	(1,847)	(2,317)
Depreciation	(477)	(312)
Leases	(5,691)	(5,686)
Deferred compensation	(22)	(24)
Gross deferred tax liabilities	(8,037)	(8,339)
Net deferred tax assets (liabilities)	3,154	1,781
Net non-current assets	4,946	393	$ 453
Net non-current liabilities	(1,792)	(2,174)
Net deferred tax assets (liabilities)	$ 3,154	$ 1,781