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Statements of Consolidated Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Tax provision (benefit) for recognized net actuarial loss | $ 219 | $ 6 | $ 187
Tax provision (benefit) | $ 245 | $ (3,115) | $ 2,506
Purchase of common shares | 198,589 | 40,145 | 89,807
Issuance of common shares | 1,899 | 3,531 | 34,575
Restricted shares awards | 20,614 | 42,678 | 68,369
Common shares issued to rabbi trust | 7,113 | 43,592 | 69,120
Cash dividends declared per share | $ 0.80 | $ 0.80 | $ 0.60
Common Shares [Member] |  |  |
Issuance of common shares | 1,899 | 3,531 | 34,575
Restricted shares awards | 20,614 | 42,678 | 68,369
Common Shares Issued to Rabbi Trust [Member] |  |  |
Common shares issued to rabbi trust | 7,113 | 43,592 | 69,120
Deferred Compensation Liability [Member] |  |  |
Common shares issued to rabbi trust | 7,113 | 43,592 | 69,120
Paid In Capital [Member] |  |  |
Issuance of common shares | 1,899 | 3,531 | 34,575
Restricted shares awards | 20,614 | 42,678 | 68,369
Retained Earnings [Member] |  |  |
Cash dividends declared per share | $ 0.80 | $ 0.8 | $ 0.6
Treasury Stock [Member] |  |  |
Purchase of common shares | 198,589 | 40,145 | 89,807
Unrecognized Pension Benefit Cost [Member] |  |  |
Tax provision (benefit) for recognized net actuarial loss | $ 219 | $ 6 | $ 187
Tax provision (benefit) | $ 245 | $ (3,115) | $ 2,506

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