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Subsequent Events - Declaration of Dividends (Details) - $ / shares
 3 Months Ended 6 Months Ended
Aug. 03, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Subsequent Event [Line Items]          
Quarterly dividend (in dollars per share)   $ 0.05 $ 0.05 $ 0.1 $ 0.1
Class A common shares          
Subsequent Event [Line Items]          
Quarterly dividend (in dollars per share)   0.05 0.05    
Class B common shares          
Subsequent Event [Line Items]          
Quarterly dividend (in dollars per share)   0.05 0.05    
5.0% Series A Participating Preferred Shares          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share)   $ 0.3125 0.3125    
Preferred stock, dividend rate, percentage   5.00%   5.00%  
5.0% Series B Participating Preferred Shares          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share)   $ 0.3125 0.3125    
Preferred stock, dividend rate, percentage   5.00%   5.00%  
5.5% Series C Participating Preferred Shares          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share)   $ 0.34375 0.34375    
Preferred stock, dividend rate, percentage   5.50%   5.50%  
Series D Perpetual Preferred Shares          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share)   $ 0.40625 $ 0.17153    
Preferred stock, dividend rate, percentage   6.50%      
Series E Perpetual Preferred Shares          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share)   $ 0.39688      
Preferred stock, dividend rate, percentage   6.35%      
Series F Perpetual Preferred Shares          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share)   $ 0.27335      
Subsequent Event | Class A common shares | Dividend Declared          
Subsequent Event [Line Items]          
Quarterly dividend (in dollars per share) $ 0.05        
Subsequent Event | Class B common shares | Dividend Declared          
Subsequent Event [Line Items]          
Quarterly dividend (in dollars per share) 0.05        
Subsequent Event | 5.0% Series A Participating Preferred Shares | Dividend Declared          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share) $ 0.3125        
Preferred stock, dividend rate, percentage 5.00%        
Subsequent Event | 5.0% Series B Participating Preferred Shares | Dividend Declared          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share) $ 0.3125        
Preferred stock, dividend rate, percentage 5.00%        
Subsequent Event | 5.5% Series C Participating Preferred Shares | Dividend Declared          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share) $ 0.34375        
Preferred stock, dividend rate, percentage 5.50%        
Subsequent Event | Series D Perpetual Preferred Shares | Dividend Declared          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share) $ 0.40625        
Preferred stock, dividend rate, percentage 6.50%        
Subsequent Event | Series E Perpetual Preferred Shares | Dividend Declared          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share) $ 0.39688        
Preferred stock, dividend rate, percentage 6.35%        
Subsequent Event | Series F Perpetual Preferred Shares | Dividend Declared          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share) $ 0.36719        
Preferred stock, dividend rate, percentage 5.875%        
Subsequent Event | Series G, Preferred Perpetual Shares | Dividend Declared          
Subsequent Event [Line Items]          
Quarterly preferred dividend (in dollars per share) $ 0.30191        
Preferred stock, dividend rate, percentage 5.875%