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Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Apr. 05, 2018
market
shares
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
market
$ / shares
shares
Mar. 31, 2017
Dec. 31, 2017
USD ($)
$ / shares
shares
Class of Stock [Line Items]          
Preferred shares, shares outstanding (in shares)     38,350,000   38,350,000
Liquidation Value | $     $ 987,988   $ 986,986
Liquidation value (in dollars per share) | $ / shares     $ 25.00    
Cumulative change in value of index based on purchase prices     50.00%    
Number of top markets used for purchase price index | market     20    
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)     7,600,000   7,600,000
Liquidation Value | $     $ 219,238   $ 218,236
5.5% Series C Participating Preferred Shares | Subsequent Event          
Class of Stock [Line Items]          
Stock converted during period (in shares) 7,600,000        
Series D Perpetual Preferred Shares/Units          
Class of Stock [Line Items]          
Preferred stock, dividend rate, percentage     6.50%    
Preferred shares, shares outstanding (in shares)     10,750,000   10,750,000
Liquidation Value | $     $ 268,750   $ 268,750
Series E Perpetual Preferred Shares          
Class of Stock [Line Items]          
Preferred stock, dividend rate, percentage     6.35%    
Preferred shares, shares outstanding (in shares)     9,200,000   9,200,000
Liquidation Value | $     $ 230,000   $ 230,000
Series F Perpetual Preferred Shares          
Class of Stock [Line Items]          
Preferred stock, dividend rate, percentage     5.875%    
Preferred shares, shares outstanding (in shares)     6,200,000   6,200,000
Liquidation Value | $     $ 155,000   $ 155,000
Series G Perpetual Preferred Shares          
Class of Stock [Line Items]          
Preferred stock, dividend rate, percentage     5.875%    
Preferred shares, shares outstanding (in shares)     4,600,000   4,600,000
Liquidation Value | $     $ 115,000   $ 115,000
Class A common shares/units          
Class of Stock [Line Items]          
Common shares, par value (in dollars per share) | $ / shares     $ 0.01   $ 0.01
Class A common shares/units | Scenario, Forecast          
Class of Stock [Line Items]          
Allocation to participating preferred shareholders | $   $ 32,200      
Class A common shares/units | Subsequent Event          
Class of Stock [Line Items]          
Issuance of common shares, net of offering costs (in shares) 10,848,827        
Stock exchange ratio 1.4275        
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%