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Earnings Per Share (Narrative) (Details)
 3 Months Ended
Mar. 31, 2020
item
shares
Mar. 31, 2019
shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Number of active share-based compensation plans | item 2  
Potentially dilutive common shares 34,373 40,766
Stock-Settled Stock Appreciation Rights (SSARs) [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Potentially dilutive common shares 28,070 29,708
Restricted Stock [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Potentially dilutive common shares 6,303 11,058