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Condensed Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts Receivable, Current	$ 26,257	$ 26,713
Common Class A [Member]
Common Stock, Shares, Issued	24,888,661	24,884,265
Common Stock, Shares, Outstanding	24,728,923	24,704,772
Common Class B [Member]
Common Stock, Shares, Issued	5,092,021	5,096,421
Common Stock, Shares, Outstanding	5,091,104	5,095,504
Treasury Class A [Member]
Treasury Stock, Shares	159,738	179,493
Treasury Class B [Member]
Treasury Stock, Shares	917	917

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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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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