Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Accounts receivable reserves	$ 604	$ 829
Accrued liabilities	2,367	1,657
Deferred compensation obligation	5,702	5,046
Stock-based compensation	715	618
Operating lease liabilities	4,704	5,223
Pension and post-retirement benefit plans	2,929	3,721
Deferred payroll taxes	4,965	4,978
Other	11	461
Deferred tax assets	21,997	22,533
Deferred tax liabilities:
Prepaid expenses	(604)	(489)
Fixed assets	(4,185)	(2,811)
Goodwill and intangible assets	(2,413)	(2,370)
ROU assets for operating leases	(3,965)	(4,347)
Partnership basis difference	(2,966)	(1,469)
Other	(207)	(309)
Deferred tax liabilities	(14,340)	(11,795)
Valuation allowance	0	0
Total Deferred tax assets, net	$ 7,657	$ 10,738