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Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 05, 2018
market
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
market
$ / shares
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Class of Stock [Line Items]            
Preferred shares, shares outstanding (in shares) | shares   30,750,000   30,750,000   38,350,000
Liquidation Value | $   $ 768,750   $ 768,750   $ 986,986
Liquidation value (in dollars per share) | $ / shares   $ 25.00   $ 25.00    
Number of top markets used for purchase price index | market       20    
Redemption of participating preferred shares/units | $   $ 32,215 $ 0 $ 32,215 $ 0  
5.5% Series C Participating Preferred Shares            
Class of Stock [Line Items]            
Preferred stock, dividend rate, percentage     5.50% 5.50%    
Preferred shares, shares outstanding (in shares) | shares   0   0   7,600,000
Liquidation Value | $   $ 0   $ 0   $ 218,236
Stock converted during period (in shares) | shares 7,600,000          
Series D Perpetual Preferred Shares/Units            
Class of Stock [Line Items]            
Preferred stock, dividend rate, percentage   6.50% 6.50% 6.50%    
Preferred shares, shares outstanding (in shares) | shares   10,750,000   10,750,000   10,750,000
Liquidation Value | $   $ 268,750   $ 268,750   $ 268,750
Series E Perpetual Preferred Shares            
Class of Stock [Line Items]            
Preferred stock, dividend rate, percentage   6.35% 6.35% 6.35%    
Preferred shares, shares outstanding (in shares) | shares   9,200,000   9,200,000   9,200,000
Liquidation Value | $   $ 230,000   $ 230,000   $ 230,000
Series F Perpetual Preferred Shares            
Class of Stock [Line Items]            
Preferred stock, dividend rate, percentage   5.875% 5.875% 5.875%    
Preferred shares, shares outstanding (in shares) | shares   6,200,000   6,200,000   6,200,000
Liquidation Value | $   $ 155,000   $ 155,000   $ 155,000
Series G Perpetual Preferred Shares            
Class of Stock [Line Items]            
Preferred stock, dividend rate, percentage   5.875%   5.875%    
Preferred shares, shares outstanding (in shares) | shares   4,600,000   4,600,000   4,600,000
Liquidation Value | $   $ 115,000   $ 115,000   $ 115,000
Class A common shares/units            
Class of Stock [Line Items]            
Issuance of common shares, net of offering costs (in shares) | shares 10,848,827          
Stock exchange ratio 1.4275          
Common shares, par value (in dollars per share) | $ / shares   $ 0.01   $ 0.01   $ 0.01
Percent of liquidation preference 50.00%          
Number of markets used in calculation of conversion ratio | market 20          
Conversion ratio, maximum internal rate of return 9.00%          
Redemption of participating preferred shares/units | $   $ 32,200