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Statement Of Consolidated Shareholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Tax provision (benefit) for recognized net actuarial loss (gain)	$ (23)			$ (38)
Common Shares [Member]
Issuance of common shares	6,167	484	62,387	456	7,400	63,316
Common Shares Issued to Rabbi Trust [Member]
Common shares issued to rabbi trust	417	484	12,752	19,043	400
Common shares distributed from rabbi trust						3,727
Deferred Compensation Liability [Member]
Common shares issued to rabbi trust	417	484	12,752	19,043	400
Common shares distributed from rabbi trust						3,727
Paid In Capital [Member]
Issuance of common shares	6,167	484	62,387	456	7,400	63,316
Retained Earnings [Member]
Cash dividends declared per share	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20
Treasury Stock [Member]
Purchase of common shares	26,904		29,436	7,070	13,800	52,590
Unrecognized Pension Benefit Cost [Member]
Tax provision (benefit) for recognized net actuarial loss (gain)	$ 23	$ 27	$ 28	$ 39	$ 35	$ 35

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