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

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