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Other Benefit Plans (Schedule of Employees Eligible to Participate in Employee Stock Purchase Plan) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]
ESPP shares purchased	5,151	4,132	3,578
Average purchase price per share	$ 26.015	$ 28.716	$ 29.027

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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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