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Stock Based Compensation (Outstanding Employee Stock Awards) (Details) - $ / shares
May 13, 2020
Feb. 19, 2020
May 03, 2019
May 17, 2018
Sep. 30, 2020
Mar. 19, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested shares (in shares)         925,367    
Stock Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grant date fair value (in dollars per share)         $ 24.07   $ 25.15
Unvested shares (in shares)         925,367   1,045,020
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Net Shares Granted (in shares)       250,680      
Grant date fair value (in dollars per share)       $ 17.84      
Unvested shares (in shares)         52,895    
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 | Year 1              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       25.00%      
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 | Year 2              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       25.00%      
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 | Year 3              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       25.00%      
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 | Year 4              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       25.00%      
Deferred Stock Awards | Deferred Stock Award, Granted May 3, 2019              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Net Shares Granted (in shares)     274,998        
Grant date fair value (in dollars per share)     $ 21.04        
Unvested shares (in shares)         134,173    
Deferred Stock Awards | Deferred Stock Award, Granted May 3, 2019 | Year 1              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage     25.00%        
Deferred Stock Awards | Deferred Stock Award, Granted May 3, 2019 | Year 2              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage     25.00%        
Deferred Stock Awards | Deferred Stock Award, Granted May 3, 2019 | Year 3              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage     25.00%        
Deferred Stock Awards | Deferred Stock Award, Granted May 3, 2019 | Year 4              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage     25.00%        
Deferred Stock Awards | Deferred Stock Award, Granted February 19, 2020              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Net Shares Granted (in shares)   178,309          
Grant date fair value (in dollars per share)   $ 24.41          
Unvested shares (in shares)         143,973    
Deferred Stock Awards | Deferred Stock Award, Granted February 19, 2020 | Year 1              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage   25.00%          
Deferred Stock Awards | Deferred Stock Award, Granted February 19, 2020 | Year 2              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage   25.00%          
Deferred Stock Awards | Deferred Stock Award, Granted February 19, 2020 | Year 3              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage   25.00%          
Deferred Stock Awards | Deferred Stock Award, Granted February 19, 2020 | Year 4              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage   25.00%          
Deferred Stock Awards | Deferred Stock Award, Granted May 13, 2020              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Net Shares Granted (in shares) 45,780            
Grant date fair value (in dollars per share) $ 13.76            
Vesting percentage 100.00%            
Unvested shares (in shares)         45,780    
Performance Share Awards | Performance Share Program Award, Granted May 17, 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Net Shares Granted (in shares)       0      
Grant date fair value (in dollars per share)       $ 23.52      
Unvested shares (in shares)         200,674    
Performance Share Awards | Performance Share Program Award, Granted May 3, 2019              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Net Shares Granted (in shares)     0        
Grant date fair value (in dollars per share)     $ 29.43        
Unvested shares (in shares)         181,527    
Performance Share Awards | Performance Share Program Award, Granted March 19, 2020              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Net Shares Granted (in shares)           0  
Grant date fair value (in dollars per share)           $ 25.83  
Unvested shares (in shares)         166,345