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Statements of Consolidated Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax provision (benefit) for recognized net actuarial loss (gain)	$ 112	$ 123
Tax provision (benefit)	$ (433)	$ (60)
Common Shares [Member]
Issuance of common shares	89,946	88,377	34,521
Common Shares Issued to Rabbi Trust [Member]
Common shares distributed from rabbi trust	2,133	1,989	19,396
Deferred Compensation Liability [Member]
Common shares distributed from rabbi trust	2,133	1,989	19,396
Paid In Capital [Member]
Issuance of common shares	89,946	88,377	34,521
Retained Earnings [Member]
Cash dividends declared per share	$ 0.80	$ 0.80	$ 0.80
Treasury Stock [Member]
Purchase of common shares	180,692	120,848	52,318
Unrecognized Pension Benefit Cost [Member]
Tax provision (benefit) for recognized net actuarial loss (gain)	$ 112	$ 123	$ 139
Tax provision (benefit)	$ (433)	$ (60)	$ (77)

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