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Earnings Per Common Share And Share Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Earnings Per Common Share And Share Awards [Line Items]      
Anti-dilutive shares excluded from computation of diluted earnings per share 15 9  
Number of SARs granted where exercise price was less than market price on date of grant 0    
SARs      
Earnings Per Common Share And Share Awards [Line Items]      
SARs expiration period 7 years    
Share-based Payment Arrangement, Expense $ 118 $ 88  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 171    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 7 0 4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 35.49    
Minimum | SARs      
Earnings Per Common Share And Share Awards [Line Items]      
SARs vesting period 1 year    
Maximum | SARs      
Earnings Per Common Share And Share Awards [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award 250    
SARs vesting period 5 years