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Share-Based Compensation (Narrative) (Details)
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Performance Based Nonvested Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance share awards, grant date fair value | $ / shares $ 34.22
Award vesting period 3 years
Performance share awards, shares vesting | shares 65,632
Time Based Nonvested Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period 3 years
Nonvested share units granted | shares 11,765
Nonvested share units weighted average grant date fair value | $ / shares $ 39.56