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Performance Incentive Plan (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares)       1,800,000,000
Stock options outstanding (in shares) 0      
Restricted shares granted (in shares) 30,257,000      
Share-based compensation cost $ 14,296,000 $ 14,213,000 $ 10,737,000  
Unrecognized compensation cost $ 12,288,000      
Weighted average period for recognition of unrecognized compensation cost 2 years 2 months 12 days      
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares granted (in shares) 345,891,000      
Restricted stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 3 years      
Restricted stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 5 years      
Performance shares, subject to shareholder return        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares granted (in shares) 242,555      
Performance period used In calculation 3 years      
Fair value share price (in dollars per share) $ 27.50      
Performance shares, subject to Core Funds From Operations growth        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant price (in dollars per share) $ 42.30