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Statements of Consolidated Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Tax provision (benefit) for recognized net actuarial loss | $ 196 | $ 219 |
Tax provision | $ 21 | $ 245 |
Cash dividends declared per share | $ 0.80 | $ 0.80 | $ 0.80
Common Shares [Member] |  |  |
Issuance of common shares | 10,332 | 1,899 | 3,531
Restricted shares awards | 4,799 | 20,164 | 42,678
Common Shares Issued to Rabbi Trust [Member] |  |  |
Common shares issued to rabbi trust | 646 | 7,113 | 43,592
Deferred Compensation Liability [Member] |  |  |
Common shares issued to rabbi trust | 646 | 7,113 | 43,592
Paid In Capital [Member] |  |  |
Issuance of common shares | 10,332 | 1,899 | 3,531
Restricted shares awards | 4,799 | 20,164 | 42,678
Retained Earnings [Member] |  |  |
Cash dividends declared per share | $ 0.80 | $ 0.80 | $ 0.80
Treasury Stock [Member] |  |  |
Purchase of common shares | 118,430 | 198,589 | 40,145
Unrecognized Pension Benefit Cost [Member] |  |  |
Tax provision (benefit) for recognized net actuarial loss | $ 196 | $ 219 | $ 6
Tax provision | $ 21 | $ 245 | $ 3,115

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