Income Taxes - Income tax rate reconciliation (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%
Non-deductibility of goodwill impairment	0.00%	(17.90%)	0.00%
Non-deductibility of officer's compensation	2.20%	(0.90%)	1.00%
State and other taxes, net of federal tax benefit	3.10%	1.20%	2.80%
Excess tax deficiencies or benefits	(7.10%)	0.10%	(0.60%)
Change in unrecognized tax benefits	(0.10%)	2.00%	1.80%
Change in valuation allowance	0.50%	(1.50%)	0.50%
Changes in tax rates and state tax laws	0.20%	(0.40%)	(0.50%)
General business credits	(0.90%)	0.80%	(1.30%)
Other	0.80%	(0.20%)	(0.10%)
Effective tax rate	19.70%	4.20%	24.60%