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Shareholders' Equity (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jul. 15, 2021
USD ($)
$ / shares
Jun. 17, 2021
$ / shares
shares
May 20, 2021
USD ($)
$ / shares
Feb. 18, 2021
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
trustee
$ / shares
shares
Jun. 30, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of trustees | trustee         8  
Share repurchases (in shares) | shares   12,009        
Stock repurchase price (in dollars per share)   $ 29.33        
Cash distribution to common shareholders (in dollars per share)     $ 0.55 $ 0.55 $ 1.10  
Distributions to common shareholders | $     $ 26,575 $ 26,575 $ 53,150 $ 53,021
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         3,500  
Shares granted (in dollars per share)         $ 29.88