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Earnings per Share & Stock Compensation - Narrative (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Anti-dilutive awards outstanding (fewer than) (in shares) 110,000     110,000 110,000 110,000
Relative Total Shareholder Return Awards (RTSRs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share performance period         3 years  
Bottom portion of peer percent group (as a percent)         25.00%  
Top portion of peer percent group (as a percent)         25.00%  
Relative Total Shareholder Return Awards (RTSRs) | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares, issued (in shares)         0  
Relative Total Shareholder Return Awards (RTSRs) | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued (as a percent)         150.00%  
Employee | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)   11,000 70,000   81,000  
Restricted stock units granted (in dollars per share)   $ 52.70 $ 48.47      
Employee | Relative Total Shareholder Return Awards (RTSRs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)     40,000      
Restricted stock units granted (in dollars per share)     $ 56.32      
Director | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)     14,000      
Restricted stock units granted (in dollars per share)     $ 48.47