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Condensed Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accounts receivable, less allowance for doubtful accounts	$ 24,650	$ 26,713
Common Class A [Member]
Common Stock, Shares, Issued	24,912,299	24,884,265
Common Stock, Shares, Outstanding	24,701,163	24,704,772
Common Class B [Member]
Common Stock, Shares, Issued	5,100,633	5,096,421
Common Stock, Shares, Outstanding	5,099,716	5,095,504
Treasury Class A [Member]
Treasury Stock, Shares	211,136	179,493
Treasury Class B [Member]
Treasury Stock, Shares	917	917

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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X

- Definition

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.

+ References

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X

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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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