Earnings Per Share (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020 ShareBasedCompensationPlan shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Number of active share-based compensation plans | ShareBasedCompensationPlan	2
Potentially dilutive common shares	30,140	42,811	43,194
Stock-Settled Stock Appreciation Rights (SSARs) [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Potentially dilutive common shares	24,644	32,091	29,301
Restricted Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Potentially dilutive common shares	5,496	10,720	13,893