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Stock Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2011
Stock Compensation Plans [Abstract] |
Schedule Of Fair Value Options Granted Date Using Weighted-Average Assumptions |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Risk-free interest rate |  |  | 1.92 | % |  |  | 2.12 | % |  |  | 1.73 | %
Expected life of option |  |  | 4.70 yrs. |  |  |  | 4.66 yrs. |  |  |  | 4.55 yrs. |
Expected dividend yield |  |  | 2.34 | % |  |  | 2.22 | % |  |  | 3.25 | %
Expected volatility |  |  | 26.82 | % |  |  | 26.42 | % |  |  | 32.66 | %
Schedule Of Fair Value For Non-Vested Shares Granted Date Using Weighted-Average Assumptions |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Risk-free interest rate |  |  | 1.04 | % |  |  | 1.25 | % |  |  | 1.21 | %
Expected dividend yield |  |  | 2.34 | % |  |  | 2.24 | % |  |  | 3.18 | %
Schedule Of Stock Option Activity |
|  | Shares Subject to Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life In Years |  |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  |  |  |  | (Dollars in thousands) |
Outstanding, beginning of the year |  |  | 2,274,627 |  |  | $ | 56.17 |  |  |  |  |  |  |  |  |
Granted |  |  | 383,275 |  |  |  | 57.92 |  |  |  |  |  |  |  |  |
Exercised |  |  | (683,132 | ) |  |  | 50.22 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (842,224 | ) |  |  | 60.44 |  |  |  |  |  |  |  |  |
Outstanding, end of the year |  |  | 1,132,546 |  |  | $ | 57.17 |  |  |  | 6.8 |  |  | $ | 5,613 |
Exercisable, end of the year |  |  | 628,325 |  |  | $ | 56.31 |  |  |  | 5.2 |  |  | $ | 4,053 |
Schedule Of Non-Vested Restricted Stock Unit Activity |
|  | Number of Non-Vested Shares |  |  | Weighted Average Grant Date Price |  |  | Weighted Average Remaining Contractual Life In Years |  |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  |  |  |  | (Dollars in thousands) |
Outstanding, beginning of the year |  |  | 386,543 |  |  | $ | 55.03 |  |  |  |  |  |  |  |  |
Granted |  |  | 175,291 |  |  |  | 58.14 |  |  |  |  |  |  |  |  |
Vested |  |  | (90,508 | ) |  |  | 57.14 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (136,867 | ) |  |  | 53.79 |  |  |  |  |  |  |  |  |
Outstanding, end of the year |  |  | 334,459 |  |  | $ | 56.60 |  |  |  | 1.5 |  |  | $ | 20,499 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (d)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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