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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Receivables, reserve $ 16 $ 16
Intangible assets, accumulated amortization 30,028 26,372
Property and equipment, accumulated depreciation $ 109,863 $ 106,317
Treasury stock, shares (in shares) 10,966,089 10,174,013
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) 98,539,367 99,331,443