Statements of Consolidated Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022
Common Shares [Member]
Issuance of common shares	9,655	72,477	484	62,387
Common Shares Issued to Rabbi Trust [Member]
Common shares distributed from rabbi trust	502	3,541	484	1,347
Deferred Compensation Liability [Member]
Common shares distributed from rabbi trust	502	3,541	484	1,347
Paid In Capital [Member]
Issuance of common shares	9,655	72,477	484	62,387
Retained Earnings [Member]
Cash dividends declared per share	$ 0.20	$ 0.20	$ 0.20	$ 0.20
Treasury Stock [Member]
Purchase of common shares	40,078	41,573		29,436
Unrecognized Pension Benefit Cost [Member]
Tax provision (benefit) for recognized net actuarial loss (gain)	$ (28)	$ (28)	$ (28)	$ (28)

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