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Stock Options and Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Stock Options and Incentive Plans [Abstract] |
Schedule of Stock Option Activity |
|  | 2012 |  | 2011 |  | 2010
Shares under option January 1 |  | 597,313 |  |  | 639,163 |  |  | 651,143 |
Options canceled |  | 23,300 |  |  | 400 |  |  | 4,750 |
Options exercised |  | 66,700 |  |  | 41,450 |  |  | 7,230 |
Shares under option at December 31 |  | 507,313 |  |  | 597,313 |  |  | 639,163 |
Options exercisable at December 31 |  | 507,313 |  |  | 597,313 |  |  | 639,163 |
Schedule of Weighted Average Exercise Price |
|  | 2012 |  | 2011 |  | 2010
Shares under option January 1 |  | $19.54 |  |  | $19.51 |  |  | $19.50 |
Options granted |  | - |  |  | - |  |  | - |
Options canceled |  | 21.23 |  |  | 20.54 |  |  | 21.98 |
Options exercised |  | 19.65 |  |  | 19.03 |  |  | 17.66 |
Shares under option December 31 |  | 19.45 |  |  | 19.54 |  |  | 19.51 |
Options exercisable December 31 |  | 19.45 |  |  | 19.54 |  |  | 19.51 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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