Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
State taxes	$ 3,932	$ 1,111
Stock options	461	1,293
Accrued expenses	3,905	2,334
Allowance for bad debts	351	544
Investment in other entities	702	2,977
Net operating loss carryforward	20,758	13,850
Lease liability	4,979	3,568
Other	665	0
Deferred tax assets before valuation allowance	35,753	25,677
Valuation allowance	(15,517)	(8,192)
Net deferred tax assets	20,236	17,485
Deferred tax liabilities
Property and equipment	(661)	(927)
Acquired intangible assets	(24,661)	(29,195)
Right-of-use assets	(4,888)	(3,544)
481(a) adjustment	(985)	(1,623)
Other	0	(465)
Deferred tax liabilities	(31,195)	(35,754)
Net deferred liabilities	$ (10,959)	$ (18,269)