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Equity Incentive Plans (Summary Of Nonvested Share Activity) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
May 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Number of Shares, Outstanding at December 31, 2022     609,228        
Number of Shares, Granted     290,271        
Number of Shares, Vested     (284,885)        
Number of Shares, Outstanding at September 30, 2023 614,614   614,614        
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2022     $ 44.44        
Weighted Average Grant Date Fair Value, Granted     41.96        
Weighted Average Grant Date Fair Value, Vested     45.47        
Weighted Average Grant Date Fair Value, Outstanding at September 30, 2023 $ 42.79   $ 42.79        
Weighted Average Life Remaining, Outstanding at September 30, 2023 (in years)     1 year 4 months 9 days        
Fair value of non-vested shares     $ 13,700,000 $ 8,600,000      
Unamortized share-based compensation expense $ 13,000,000.0   13,000,000.0        
Severance Costs $ 0 $ 547,000 $ 1,836,000 547,000      
2016 Equity Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Common shares, options to purchase common shares and restricted share units, expected to granted (in shares)             3,950,000
Number of shares available for grant (in shares) 863,716   863,716        
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Share-based Payment Arrangement, Expense     $ 3,400,000 3,800,000      
Severance Costs     $ 700,000 0      
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Number of Shares, Outstanding at December 31, 2022     312,641        
Number of Shares, Granted     116,266        
Number of Shares, Vested     (102,438)        
Number of Shares, Outstanding at September 30, 2023 326,469   326,469        
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2022     $ 70.04        
Weighted Average Grant Date Fair Value, Granted     44.76        
Weighted Average Grant Date Fair Value, Vested     75.14        
Weighted Average Grant Date Fair Value, Outstanding at September 30, 2023 $ 59.44   $ 59.44        
Unamortized share-based compensation expense $ 7,400,000   $ 7,400,000        
Share-based Compensation, Performance Measure Percent, Peer TSR 50.00%   50.00%        
Share-based Compensation, Performance Measure Percent, MSCI US REIT Index TSR 25.00%   25.00%        
Share-based Compensation, Performance Measure Percent, Growth in AFFO per share 25.00%   25.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum     4.50%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     30.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     3 years        
Dividend, Share-based Payment Arrangement     $ 1,000,000.0 803,000      
Share-based Payment Arrangement, Expense     2,900,000 4,000,000      
Severance Costs     $ 900,000        
Performance Shares [Member] | Granted in 2024              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Share-based Compensation, Performance Measure Percent, Peer TSR 52.20%   52.20%        
Share-based Compensation, Performance Measure Percent, MSCI US REIT Index TSR 26.10%   26.10%        
Share-based Compensation, Performance Measure Percent, Growth in AFFO per share 21.70%   21.70%        
Performance Shares [Member] | Market Condition              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Share Based Compensation Arrangement, Equity Instrument, Other Than Options, Market Condition, Grant Date Fair Value $ 4,100,000 $ 5,900,000 $ 4,100,000 $ 5,900,000      
Performance Shares [Member] | Market Condition | Granted in 2021              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     250.00%        
Performance Shares [Member] | Performance Condition | Granted in 2021              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Fair value of non-vested shares     $ 12,600,000        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     200.00%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period     243,290        
Performance Shares [Member] | Performance Condition | Granted in 2022              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     200.00%        
Share-based Compensation Arrangement, Equity Instruments Other Than Options, Performance Condition, Nonvested, Grant Date Fair Value           $ 2,300,000  
Performance Shares [Member] | Performance Condition | Granted in 2023              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     52.30%        
Share-based Compensation Arrangement, Equity Instruments Other Than Options, Performance Condition, Nonvested, Grant Date Fair Value         $ 600,000    
Dividend Paid | Performance Condition | Granted in 2021              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period     49,574