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Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Class of Stock [Line Items]        
Preferred shares, shares outstanding (in shares)   15,400,000 15,400,000 35,350,000
Current Liquidation Value   $ 385,000 $ 385,000 $ 883,750
Preferred shares, par value (in dollars per share)   $ 0.01 $ 0.01 $ 0.01
Series D perpetual preferred shares        
Class of Stock [Line Items]        
Preferred stock, dividend rate (in percent) 6.50%   6.50%  
Preferred shares, shares outstanding (in shares)   0 0 10,750,000
Current Liquidation Value   $ 0 $ 0 $ 268,750
Preferred stock redeemed (in shares) 10,750,000      
Preferred shares, par value (in dollars per share)   $ 0.01 $ 0.01  
Liquidation preference (in dollars per share)   $ 25.00 $ 25.00  
Liquidation value in excess of carrying value   $ 8,500    
Series E perpetual preferred shares        
Class of Stock [Line Items]        
Preferred stock, dividend rate (in percent) 6.35%   6.35%  
Preferred shares, shares outstanding (in shares)   0 0 9,200,000
Current Liquidation Value   $ 0 $ 0 $ 230,000
Preferred stock redeemed (in shares) 9,200,000      
Preferred shares, par value (in dollars per share)   $ 0.01 $ 0.01  
Liquidation preference (in dollars per share)   $ 25.00 $ 25.00  
Liquidation value in excess of carrying value   $ 7,400    
Series F perpetual preferred shares        
Class of Stock [Line Items]        
Preferred stock, dividend rate (in percent)     5.875%  
Preferred shares, shares outstanding (in shares)   6,200,000 6,200,000 6,200,000
Current Liquidation Value   $ 155,000 $ 155,000 $ 155,000
Series G perpetual preferred shares        
Class of Stock [Line Items]        
Preferred stock, dividend rate (in percent)     5.875%  
Preferred shares, shares outstanding (in shares)   4,600,000 4,600,000 4,600,000
Current Liquidation Value   $ 115,000 $ 115,000 $ 115,000
Series H perpetual preferred shares        
Class of Stock [Line Items]        
Preferred stock, dividend rate (in percent)     6.25%  
Preferred shares, shares outstanding (in shares)   4,600,000 4,600,000 4,600,000
Current Liquidation Value   $ 115,000 $ 115,000 $ 115,000