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Statements of Consolidated Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tax provision (benefit) for recognized net actuarial loss (gain) | $ 112 | $ 123 |
Tax provision (benefit) | $ (433) | $ (60) |
Common Shares [Member] |  |  |
Issuance of common shares | 89,946 | 88,377 | 34,521
Common Shares Issued to Rabbi Trust [Member] |  |  |
Common shares distributed from rabbi trust | 2,133 | 1,989 | 19,396
Deferred Compensation Liability [Member] |  |  |
Common shares distributed from rabbi trust | 2,133 | 1,989 | 19,396
Paid In Capital [Member] |  |  |
Issuance of common shares | 89,946 | 88,377 | 34,521
Retained Earnings [Member] |  |  |
Cash dividends declared per share | $ 0.80 | $ 0.80 | $ 0.80
Treasury Stock [Member] |  |  |
Purchase of common shares | 180,692 | 120,848 | 52,318
Unrecognized Pension Benefit Cost [Member] |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ 112 | $ 123 | $ 139
Tax provision (benefit) | $ (433) | $ (60) | $ (77)

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