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Condensed Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts receivable allowance for doubtful accounts	$ 18,553	$ 19,807
Common Class A [Member]
Common Stock, Shares, Issued	25,086,359	25,072,619
Common Stock, Shares, Outstanding	24,692,104	24,767,870
Common Class B [Member]
Common Stock, Shares, Issued	5,071,060	5,076,186
Common Stock, Shares, Outstanding	5,071,060	5,076,186
Treasury Class A [Member]
Treasury Stock, Shares	394,255	304,749

X

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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