Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets-
Accounts receivable and allowance for doubtful accounts	$ 1,878	$ 2,186
Stock-based compensation	3,392	2,791
Accrued liabilities and expenses	36,255	39,761
Lease liabilities	27,944	22,768
Net operating loss carryforwards	10,379	12,127
Intangible assets	3,851
Other	758	627
Subtotal	84,457	80,260
Valuation allowances	(475)	(514)
Total deferred tax assets	83,982	79,746
Property and equipment	(15,534)	(13,877)
Deferred tax liabilities	1,745	1,339
Lease right-of-use asset	(27,905)	(22,715)
Long-term contracts	(964)	(609)
Intangible assets		(242)
Goodwill	(17,321)	(11,615)
Other	(1,098)	(2,626)
Total deferred tax liabilities	(62,822)	(51,684)
Net deferred tax assets	21,160	28,062
Deferred income tax assets
Deferred tax assets	$ 22,905	$ 29,401