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Statements of Consolidated Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Tax provision (benefit) for recognized net actuarial loss (gain)	$ 105	$ 145
Tax provision (benefit)	$ 206	$ 229
Common Shares [Member]
Issuance of common shares	83,391	78,730	88,377
Common Shares Issued to Rabbi Trust [Member]
Common shares distributed from rabbi trust	2,248	22,370	19,396
Deferred Compensation Liability [Member]
Common shares distributed from rabbi trust	2,248	22,370	19,396
Paid In Capital [Member]
Issuance of common shares	83,391	78,730	88,377
Retained Earnings [Member]
Cash dividends declared per share	$ 0.80	$ 0.80	$ 0.80
Treasury Stock [Member]
Purchase of common shares	73,514	73,460	120,848
Unrecognized Pension Benefit Cost [Member]
Tax provision (benefit) for recognized net actuarial loss (gain)	$ (105)	$ (145)	$ (112)
Tax provision (benefit)	$ 206	$ 229	$ 433

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