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Equity - Dividends (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Class of Stock        
Common stock, dividends (in dollars per share) $ 0.25 $ 0.25 $ 0.75 $ 0.75
Common stock, dividends, cash paid (in dollars per share) 0.25 0.25 0.75 0.75
Common units, dividends (in dollars per share) 0.25 0.25 0.75 0.75
Common units, dividends, cash paid (in dollars per share) 0.25 0.25 0.75 0.75
Series A preferred stock, dividends, cash paid (in dollars per share) 0.3906 0.3906    
Performance units, dividends, cash paid (in dollars per share) 0.25 0.25 0.75 0.75
Performance units, dividends (in dollars per share) 0.25 0.25 0.75 0.75
Series A preferred units        
Class of Stock        
Series A preferred units, dividends (in dollars per share) $ 0.3906 $ 0.3906 1.1718 1.1718
Series A preferred stock, dividends, cash paid (in dollars per share)     $ 1.1718 $ 1.1718