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Shareholders' Equity Shareholders' Equity (Details 6) - Class A common shares - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 21, 2015
Class of Stock    
Repurchase of Class A common stock, authorized amount   $ 300,000,000
Average price per share of Class A common shares $ 15.76  
Total cost of Class A common shares repurchase $ 53,679,000  
Remaining repurchase authorization $ 246,300,000  
Common Stock    
Class of Stock    
Repurchases of Class A common shares (in shares) 3,407,046