Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 141,455	$ 110,691
Marketable securities	38,367	44,528
Restricted cash	757	753
Trade receivables, (including related parties of $6,440 and $5,814) net of allowance for doubtful accounts of $7,315 and $6,572	191,486	224,713
Assets held for sale	301
Prepaid expenses and other current assets (including related parties of $274 and $274)	30,135	27,238
Total current assets	402,501	407,923
Property and equipment, net of accumulated depreciation of $197,004 and $194,448	65,868	61,362
Intangible assets subject to amortization, net of accumulated amortization of $78,897 and $75,992 (including related parties of $3,482 and $3,714)	58,908	61,811
Intangible assets not subject to amortization	207,453	207,453
Goodwill	86,991	86,991
Deferred income taxes	2,591	2,591
Operating leases right of use asset	45,883	44,413
Other assets	8,088	8,297
Total assets	878,283	880,841
Current liabilities
Current maturities of long-term debt	5,778	5,256
Accounts payable and accrued expenses (including related parties of $1,088 and $1,215)	233,791	237,415
Operating lease liabilities	6,029	5,570
Total current liabilities	245,598	248,241
Long-term debt, less current maturities, net of unamortized debt issuance costs of $1,305 and $1,221	207,016	207,292
Long-term operating lease liabilities	44,580	42,151
Other long-term liabilities	27,168	30,198
Deferred income taxes	67,357	67,590
Total liabilities	591,719	595,472
Commitments and contingencies (note 6)
Stockholders' equity
Additional paid-in capital	776,198	776,298
Accumulated deficit	(502,334)	(504,375)
Accumulated other comprehensive income (loss)	(1,368)	(1,510)
Total stockholders' equity	272,505	270,422
Noncontrolling interest	14,059	14,947
Total equity	286,564	285,369
Total liabilities and equity	878,283	880,841
Class A common stock
Stockholders' equity
Common stock	8	8
Class U common stock
Stockholders' equity
Common stock	$ 1	$ 1