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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Receivables, reserve $ 21 $ 21
Intangible assets, accumulated amortization 70,045 64,112
Property and equipment, accumulated depreciation $ 122,372 $ 119,852
Treasury stock, shares (in shares) 16,905,080 14,664,467
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) 99,505,456 99,505,456
Common stock, shares outstanding (in shares) 82,600,376 84,840,989