Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 48	$ 49
Tax credit carryforwards	173	0
Accrued expenses	2,669	2,179
Allowance for bad debt	860	609
Share-based compensation expense	245	0
Basis difference in property and equipment	30,887	36,139
Impairment of investments	0	48
Deferred revenue	0	423
Operating lease	4,196	0
State taxes	135	175
Other	2,674	4,773
Deferred tax assets, gross	41,887	44,395
Less: valuation allowance	(45)	(45)
Total deferred tax assets	41,842	44,350
Deferred tax liabilities:
Basis difference in property and equipment	(3,304)	(1,869)
ROU asset	(1,773)	0
Prepaid insurance	(312)	(203)
Other	(638)	(3,320)
Total deferred tax liabilities	(6,027)	(5,392)
Net deferred tax assets	$ 35,815	$ 38,958