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Shareholders' Equity (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 14, 2021
USD ($)
$ / shares
Sep. 15, 2021
$ / shares
shares
Aug. 19, 2021
USD ($)
$ / shares
Jun. 17, 2021
trustee
$ / shares
shares
May 20, 2021
USD ($)
$ / shares
Feb. 18, 2021
USD ($)
$ / shares
Sep. 30, 2021
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of trustees | trustee       8          
Share repurchases (in shares) | shares             25,533 37,542  
Stock repurchase price (in dollars per share)             $ 25.24 $ 26.55  
Cash distribution to common shareholders (in dollars per share)     $ 0.55   $ 0.55 $ 0.55   $ 1.65  
Distributions to common shareholders | $     $ 26,584   $ 26,575 $ 26,575   $ 79,734 $ 79,546
Subsequent Event                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Dividends declared (in dollars per share) $ 0.55                
Dividends declared | $ $ 26,600                
Trustees                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares granted (in shares) | shares   117,800   3,500          
Shares granted (in dollars per share)   $ 25.42   $ 29.88