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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY AND NONCONTROLLING INTEREST [Parenthetical]	3 Months Ended
	Mar. 31, 2013
Common Class A [Member]
Stock Repurchased During Period, Shares	7,150
Common Class D [Member]
Stock Repurchased During Period, Shares	951,974

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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