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Other Benefit Plans (Schedule of Employees Eligible to Participate in Employee Stock Purchase Plan) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
ESPP shares purchased | 8,005 | 5,151 | 4,132
Average purchase price per share | $ 19.324 | $ 26.015 | $ 28.716

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