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Condensed Consolidated Balance Sheets Parenthetical - shares	Jun. 30, 2015	Dec. 31, 2014
Common Class A [Member]
Common Stock, Shares, Issued	24,045,019	23,971,808
Common Stock, Shares, Outstanding	24,044,897	23,971,686
Common Class B [Member]
Common Stock, Shares, Issued	5,117,745	5,098,799
Common Stock, Shares, Outstanding	5,116,828	5,097,882
Treasury Class A [Member]
Treasury Stock, Shares	122	122
Treasury Class B [Member]
Treasury Stock, Shares	917	917

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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-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



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-Section 02



-Paragraph 30



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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



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-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.28,29)



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