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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Receivables, reserve $ 21 $ 21
Intangible assets, accumulated amortization 41,717 39,618
Property and equipment, accumulated depreciation $ 116,888 $ 113,624
Treasury stock, shares (in shares) 17,441,863 16,094,488
Class A    
Common stock, no par value (usd per share) $ 0 $ 0
Common stock, shares authorized (in shares) 20,000 20,000
Common stock, shares issued (in shares) 9,000 9,000
Common stock, shares outstanding (in shares) 9,000 9,000
Class B    
Common stock, no par value (usd per share) $ 0 $ 0
Common stock, shares authorized (in shares) 900,000,000 900,000,000
Common stock, shares issued (in shares) 109,505,456 109,505,456
Common stock, shares outstanding (in shares) 92,063,593 93,410,968