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Statements of Consolidated Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Tax provision (benefit) for recognized net actuarial loss | $ 187 | $ 284 | $ 156
Tax (benefit) | 2,506 | 1,627 | 2,331
Curtailment net of tax provision | 0 | 2,376 |
Purchase of common shares | 89,807 | 50,334 | 52,392
Issuance of common shares | 34,575 | 20,365 | 26,353
Restricted shares awards | 68,369 | 74,276 | 88,692
Common shares issued to rabbi trust | 69,120 | 74,996 | 85,735
Cash dividends declared per share | $ 0.60 | $ 1.00 | $ 0.80
Common Shares [Member] |  |  |
Purchase of common shares | 89,807 | 50,334 | 52,392
Issuance of common shares | 34,575 | 20,365 | 26,353
Restricted shares awards | 68,369 | 74,276 | 88,692
Common Shares Issued to Rabbi Trust [Member] |  |  |
Common shares issued to rabbi trust | 69,120 | 74,996 | 85,735
Deferred Compensation Liability [Member] |  |  |
Common shares issued to rabbi trust | 69,120 | 74,996 | 85,735
Paid In Capital [Member] |  |  |
Issuance of common shares | 34,575 | 20,365 | 26,353
Restricted shares awards | 68,369 | 74,276 | 88,692
Retained Earnings [Member] |  |  |
Purchase of common shares | 89,807 | 50,334 | 52,392
Cash dividends declared per share | $ 0.60 | $ 1.00 | $ 0.80
Defined Benefit Pension Plan Activity [Member] |  |  |
Tax provision (benefit) for recognized net actuarial loss | 187 | 284 | 156
Tax (benefit) | 2,506 | 1,627 | 2,331
Curtailment net of tax provision |  | $ 2,376 |

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