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Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 05, 2018
topMarket
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Class of Stock [Line Items]              
Preferred shares, shares outstanding (in shares) | shares   35,350,000     35,350,000 35,350,000  
Current Liquidation Value   $ 883,750     $ 883,750 $ 883,750  
Liquidation preference per share (in dollars per share) | $ / shares   $ 25.00     $ 25.00    
Convertible preferred stock converted to other securities         $ 0 $ 0 $ 32,215
Series D Perpetual Preferred Shares/Units              
Class of Stock [Line Items]              
Dividend Rate         6.50%    
Preferred shares, shares outstanding (in shares) | shares   10,750,000     10,750,000 10,750,000  
Current Liquidation Value   $ 268,750     $ 268,750 $ 268,750  
Series E Perpetual Preferred Stock              
Class of Stock [Line Items]              
Dividend Rate         6.35%    
Preferred shares, shares outstanding (in shares) | shares   9,200,000     9,200,000 9,200,000  
Current Liquidation Value   $ 230,000     $ 230,000 $ 230,000  
Series F Perpetual Preferred Stock              
Class of Stock [Line Items]              
Dividend Rate         5.875%    
Preferred shares, shares outstanding (in shares) | shares   6,200,000     6,200,000 6,200,000  
Current Liquidation Value   $ 155,000     $ 155,000 $ 155,000  
Series G Perpetual Preferred Stock              
Class of Stock [Line Items]              
Dividend Rate         5.875%    
Preferred shares, shares outstanding (in shares) | shares   4,600,000     4,600,000 4,600,000  
Current Liquidation Value   $ 115,000     $ 115,000 $ 115,000  
Series H Perpetual Preferred Stock              
Class of Stock [Line Items]              
Dividend Rate     6.25%   6.25%    
Preferred shares, shares outstanding (in shares) | shares   4,600,000     4,600,000 4,600,000  
Current Liquidation Value   $ 115,000     $ 115,000 $ 115,000  
Liquidation preference per share (in dollars per share) | $ / shares     $ 25.00        
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares     4,600,000        
Gross proceeds under issuance of preferred shares     $ 115,000        
Offering costs     $ 4,400        
Series C Preferred Stock              
Class of Stock [Line Items]              
Dividend Rate 5.50%           5.50%
Liquidation preference per share (in dollars per share) | $ / shares $ 25.00            
Stock issued during period, shares, conversion of convertible securities (in shares) | shares 7,600,000            
Class A Common Shares/units              
Class of Stock [Line Items]              
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares   14,950,000          
Offering costs   $ 200     $ 600 $ 0 $ 0
Stated value per share (in dollars per share) | $ / shares $ 0.01 $ 0.01     $ 0.01 $ 0.01  
Repurchase of class A units (in shares) | shares 10,848,827            
Stock exchange ratio 1.4275            
Percent of cumulative change in value of an index 50.00%            
Number of markets used in calculation | topMarket 20            
Maximum internal rate of return 9.00%            
Convertible preferred stock converted to other securities       $ 32,200