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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Receivables, reserve | $ 16 | $ 16
Intangible assets, accumulated amortization | 33,583 | 26,372
Property and equipment, accumulated depreciation | $ 113,757 | $ 106,317
Treasury stock, shares (in shares) | 11,947,439 | 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) | 97,558,017 | 99,331,443

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