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Consolidated Statements Of Balance Sheet (Parenthetical) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common stock, par value (in dollars per share) $ 0      
Common stock, shares authorized 500,000,000      
Common stock, shares issued 210,538,896 210,216,043 209,867,426 209,529,412
Common stock, shares outstanding 210,538,896 210,216,043 209,867,426 209,529,412
Class A Shares Of Common Stock [Member]        
Common stock, par value (in dollars per share) $ 0 $ 0   $ 0
Common stock, shares authorized 420,000,000 420,000,000    
Common stock, shares issued 130,538,896 130,216,043 129,867,426 129,529,412
Common stock, shares outstanding 130,538,896 130,216,043 129,867,426 129,529,412
Class B Shares Of Common Stock [Member]        
Common stock, par value (in dollars per share) $ 0 $ 0    
Common stock, shares authorized 80,000,000 80,000,000 80,000,000  
Common stock, shares issued 80,000,000 80,000,000 80,000,000 80,000,000
Common stock, shares outstanding 80,000,000 80,000,000 80,000,000 80,000,000