Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 109,950	$ 185,094
Marketable securities	74,278
Restricted cash	750	749
Trade receivables, (including related parties of $6,028 and $8,162) net of allowance for doubtful accounts of $6,763 and $6,398	184,872	201,747
Assets held for sale		1,963
Prepaid expenses and other current assets (including related parties of $274 and $274)	37,029	18,925
Total current assets	406,879	408,478
Property and equipment, net of accumulated depreciation of $190,316 and $183,930	58,274	62,498
Intangible assets subject to amortization, net of accumulated amortization of $109,789 and $104,687 (including related parties of $4,178 and $4,642)	58,931	64,034
Intangible assets not subject to amortization	209,053	209,053
Goodwill	73,273	71,708
Deferred income taxes	1,462	1,462
Operating leases right of use asset	24,356	25,582
Other assets	7,975	8,527
Total assets	840,203	851,342
Current liabilities
Current maturities of long-term debt	4,795	4,903
Accounts payable and accrued expenses (including related parties of $1,235 and $1,920)	229,953	212,655
Operating lease liabilities	6,097	7,304
Total current liabilities	240,845	224,862
Long-term debt, less current maturities, net of unamortized debt issuance costs of $1,532 and $1,851	206,218	207,416
Long-term operating lease liabilities	20,802	20,988
Other long-term liabilities	49,135	72,930
Deferred income taxes	67,910	68,220
Total liabilities	584,910	594,416
Commitments and contingencies (note 6)
Stockholders' equity
Additional paid-in capital	769,977	780,388
Accumulated deficit	(512,140)	(522,494)
Accumulated other comprehensive income (loss)	(2,553)	(977)
Total stockholders' equity	255,293	256,926
Total liabilities and stockholders' equity	840,203	851,342
Class A common stock
Stockholders' equity
Common stock	6	6
Class B common stock
Stockholders' equity
Common stock	2	2
Class U common stock
Stockholders' equity
Common stock	$ 1	$ 1