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Condensed Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts receivable allowance for doubtful accounts | $ 17,331 | $ 19,807
Common Class A [Member] |  |
Common Stock, Shares, Issued | 25,095,586 | 25,072,619
Common Stock, Shares, Outstanding | 24,702,495 | 24,767,870
Common Class B [Member] |  |
Common Stock, Shares, Issued | 5,070,060 | 5,076,186
Common Stock, Shares, Outstanding | 5,070,060 | 5,076,186
Treasury Class A [Member] |  |
Treasury Stock, Shares | 393,091 | 304,749

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