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Shareholders' Equity (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Mar. 05, 2021
USD ($)
Dec. 22, 2020
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2021
USD ($)
vote
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
vote
$ / shares
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
$ / shares
shares
Class of Stock [Line Items]                  
Common shares, shares authorized (in shares) | shares         500,000,000   500,000,000   500,000,000
Common shares, par value (in dollars per share) | $ / shares         $ 0.01   $ 0.01   $ 0.01
Number of votes per common share | vote         1   1    
Common shares, shares outstanding (in shares) | shares         48,767,816   48,767,816   46,973,473
Proceeds from issuance of common shares             $ 24,598,000 $ 166,000  
Preferred shares, shares authorized (in shares) | shares         100,000,000   100,000,000   100,000,000
Preferred shares, par value (in dollars per share) | $ / shares         $ 0.01   $ 0.01   $ 0.01
Preferred shares, shares issued (in shares) | shares         4,800,000   4,800,000   0
Proceeds from issuance of preferred shares             $ 120,000,000 0  
Preferred shares, shares outstanding (in shares) | shares         4,800,000   4,800,000   0
Preferred dividends         $ 1,988,000 $ 0 $ 1,988,000 $ 0  
Stock redemption, exchange ratio             1    
Vested operating partnership units held by current and former employees (in shares) | shares         976,102,000   976,102,000    
ATM Plan                  
Class of Stock [Line Items]                  
Stock purchase plan, authorized amount       $ 100,000,000          
Registration statement filed, amount   $ 100,000,000              
Stock purchase plan, remaining authorized repurchase amount         $ 77,500,000   $ 77,500,000    
DRSP Plan                  
Class of Stock [Line Items]                  
Stock purchase plan, authorized amount       $ 50,000,000          
Registration statement filed, amount     $ 50,000,000            
Stock purchase plan, remaining authorized repurchase amount         $ 48,000,000   $ 48,000,000    
Shares issued (in shares) | shares         1,261        
Proceeds from issuance of common shares         $ 15,000        
Stock purchase plan, average price per share (in dollars per share) | $ / shares         $ 11.91        
Series A Preferred Shares                  
Class of Stock [Line Items]                  
Preferred shares, par value (in dollars per share) | $ / shares $ 0.01                
Preferred shares, shares issued (in shares) | shares 4,800,000                
Preferred stock distribution rate 6.625%                
Proceeds from issuance of preferred shares $ 115,900,000                
Liquidation preference per share (in dollars per share) | $ / shares $ 25.00                
Liquidation preference per share per annum (in dollars per share) | $ / shares $ 1.65625                
Change of control, redemption option, period following change of control 120 days                
Share cap (in shares) | shares 3.701