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Condensed Consolidated Balance Sheets Parenthetical	Mar. 31, 2012	Dec. 31, 2011
Common Class A [Member]
Common Stock, Shares, Issued	23,112,346	23,020,215
Common Stock, Shares, Outstanding	23,112,346	23,020,215
Common Class B [Member]
Common Stock, Shares, Issued	5,130,409	5,164,765
Common Stock, Shares, Outstanding	5,130,409	5,164,765

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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