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Statements of Consolidated Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Tax provision for recognized net acturial loss | $ 156 | $ 106 | $ 207
Tax provision (benefit) on unfunded pension obligation | (2,331) | 96 | 646
Purchase of common shares | 52,392 | 32,687 | 3,000
Issuance of common shares | 26,353 | 14,168 | 27,468
Cash dividends declared per share | $ 0.80 | $ 0.80 | $ 0.80
Common Shares |  |  |
Purchase of common shares | 52,392 | 32,687 | 3,000
Issuance of common shares | 26,353 | 14,168 | 27,468
Restricted shares awards | 88,692 | 41,198 |
Paid in Capital |  |  |
Issuance of common shares | 26,353 | 14,168 | 27,468
Restricted shares awards | 88,692 | 41,198 |
Retained Earnings |  |  |
Purchase of common shares | 52,392 | 32,687 | 3,000
Cash dividends declared per share | $ 0.80 | $ 0.80 | $ 0.80
Accumulated Other Comprehensive Income (Loss) Unrecognized Pension Benefit Cost |  |  |
Tax provision for recognized net acturial loss | 156 | 106 | 207
Tax provision (benefit) on unfunded pension obligation | $ (2,331) | $ 96 | $ 646

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