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Stock Based Compensation Stock Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Restricted stock awards        
Stock-based compensation        
Total unrecognized compensation cost $ 4.7   $ 4.7  
Remaining weighted average vesting period for recognition of unrecognized compensation cost     1 year 9 months  
Recognized compensation expense 1.3 $ 1.4 $ 6.8 $ 6.0
Performance-based restricted stock awards        
Stock-based compensation        
Total unrecognized compensation cost 17.1   $ 17.1  
Remaining weighted average vesting period for recognition of unrecognized compensation cost     1 year 10 months 17 days  
Recognized compensation expense $ 3.1 $ 2.4 $ 9.5 $ 7.2
Period of total shareholder return upon which the percentage of shares vesting at the end of the measurement period will be based     3 years  
Period of return of the MSCI US REIT index against which total shareholder return measured     3 years  
Percentage of revenues from triple-net leases (at least)     75.00%  
End Of Measurement Period Vesting | Performance-based restricted stock awards        
Stock-based compensation        
Vesting period     3 years