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Condensed Consolidated Balance Sheets Parenthetical - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts receivable allowance for doubtful accounts $ 15,013 $ 19,807
Common Class A [Member]    
Common Stock, Shares, Issued 25,116,540 25,072,619
Common Stock, Shares, Outstanding 24,836,072 24,767,870
Common Class B [Member]    
Common Stock, Shares, Issued 5,082,161 5,076,186
Common Stock, Shares, Outstanding 5,082,161 5,076,186
Treasury Class A [Member]    
Treasury Stock, Shares 280,468 304,749