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Equity Incentive Plans (Summary Of Nonvested Share Activity) (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 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        
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        
Weighted Average Life Remaining, Outstanding at September 30, 2023 (in years) 1 year 7 months 9 days        
Fair value of non-vested shares $ 13,700,000 $ 8,300,000      
Unamortized share-based compensation expense 14,700,000        
Severance Costs $ 1,836,000 0      
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) 905,470        
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 $ 1,800,000 1,900,000      
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        
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        
Unamortized share-based compensation expense $ 8,900,000        
Share-based Compensation, Performance Measure Percent, Peer TSR 50.00%        
Share-based Compensation, Performance Measure Percent, MSCI US REIT Index TSR 25.00%        
Share-based Compensation, Performance Measure Percent, Growth in AFFO per share 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 $ 598,000 353,000      
Share-based Payment Arrangement, Expense 1,500,000 2,000,000      
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%        
Share-based Compensation, Performance Measure Percent, MSCI US REIT Index TSR 26.10%        
Share-based Compensation, Performance Measure Percent, Growth in AFFO per share 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      
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