CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND NONCONTROLLING INTEREST [Parenthetical]	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period	92,040
Common Stock Class A [Member]
Stock Repurchased During Period, Shares		32,669
Common Stock Class D [Member]
Stock Repurchased During Period, Shares		2,630,574
Converible shares, Class A to Class D [Member]
Conversion Of Stock, Shares Converted	324,482		12,000
Converible shares, Class C to Class D [Member]
Conversion Of Stock, Shares Converted	192,142