Statements of Consolidated Shareholders' Equity (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Common Shares [Member]
Issuance of common shares	26,285	9,655	72,477	6,167	484	62,387
Common Shares Issued to Rabbi Trust [Member]
Common shares distributed from rabbi trust	185	502	3,541	417	484	1,347
Deferred Compensation Liability [Member]
Common shares distributed from rabbi trust	185	502	3,541	417	484	1,347
Paid In Capital [Member]
Issuance of common shares	26,285	9,655	72,477	6,167	484	62,387
Retained Earnings [Member]
Cash dividends declared per share	$ 0.2	$ 0.2	$ 0.2	$ 0.2	$ 0.2	$ 0.2
Treasury Stock [Member]
Purchase of common shares	50,717	40,078	41,573	26,094		29,436
Unrecognized Pension Benefit Cost [Member]
Tax provision (benefit) for recognized net actuarial loss (gain)	$ (28)	$ (28)	$ (28)	$ (23)	$ (28)	$ (28)

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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Number of new stock issued during the period.

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Number of shares that have been repurchased during the period and are being held in treasury.

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