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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Aug. 04, 2020
May 04, 2020
May 31, 2014
Jun. 30, 2014
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation, Aggregate Disclosures:            
Maximum number of shares per participant, 12 month period (in shares)     1,000,000.0 2,500,000    
Extension of plan term       10 years    
Unrecognized compensation costs related to nonvested awards         $ 7.9  
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition         1 year  
Shares available for issuance under the Plan (in shares)         2,800,000  
Stock options granted (in shares)         249,900 302,700
Options, Additional Disclosures:            
Options exercised, aggregate intrinsic value         $ 1.3  
Performance Shares            
Share-based Compensation, Aggregate Disclosures:            
Share grants in period (in shares)   79,070        
Restricted Stock Units (RSUs) & Stock Options            
Share-based Compensation, Aggregate Disclosures:            
Share grants in period (in shares)   73,636        
Stock Options            
Share-based Compensation, Aggregate Disclosures:            
Stock options granted (in shares)   249,875        
Stock options granted, exercise price (in USD per share)   $ 39.98        
Restricted Stock Units (RSUs)            
Share-based Compensation, Aggregate Disclosures:            
Share grants in period (in shares)   907     179,700 220,300
Restricted Stock Units (RSUs) | Director            
Share-based Compensation, Aggregate Disclosures:            
Share grants in period (in shares) 3,732          
Number of securities into which each RSU may be converted 1          
Long-term Equity Incentive Plan, 2005            
Share-based Compensation, Aggregate Disclosures:            
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plans (in shares)     5,000,000.0      
Number of additional shares authorized (in shares)       1,800,000    
Long-term Incentive Plan, 2020            
Share-based Compensation, Aggregate Disclosures:            
Common stock, capital shares reserved for future issuance (in shares) 2,827,210          
Number of new shares for future issuance under 2020 Long-Term Incentive Plans (in shares) 2,000,000          
Number of unissued shares reserved for 2020 Long-Term Incentive Plans (in shares) 827,210