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Statements of Consolidated Shareholders' Equity (Parenthetical) (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
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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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