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Earnings Per Common Share And Share Awards (Summary Of Share-Based Award Transactions) (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Common Share And Share Awards [Abstract] |  |  |
Number Of Shares, Outstanding Beginning Balance | 101,600 | 110,800 |
Number Of Shares, SARs granted | 3,000 | 3,000 |
Number Of Shares, Options exercised | (6,130) | (7,700) |
Number Of Shares, Options/SARs cancelled/forfeited/expired | (70) | (4,500) |
Number Of Shares, Outstanding Ending Balance | 98,400 | 101,600 | 110,800
Number Of Shares, Exercisable as of June 30, 2012 | 95,600 |  |
Number Of Shares, Unvested as of June 30, 2012 | 2,800 |  |
Weighted Average Exercise Price, Outstanding Beginning Balance | $ 29.81 | $ 28.77 |
Weighted Average Exercise Price, SARs granted | $ 50.50 | $ 41.50 |
Weighted Average Exercise Price, Options exercised | $ 24.93 | $ 20.15 |
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired | $ 31.00 | $ 28.61 |
Weighted Average Exercise Price, Outstanding Ending Balance | $ 30.74 | $ 29.81 | $ 28.77
Weighted Average Exercise Price, Exercisable as of June 30, 2012 | $ 30.28 |  |
Weighted Average Exercise Price, Unvested as of June 30, 2012 | $ 46.69 |  |
Average Remaining Contractual Term, Outstanding Beginning Balance | 3 years 8 months 1 day | 3 years 10 months 28 days | 4 years 6 months 4 days
Average Remaining Contractual Term, Outstanding Ending Balance | 3 years 8 months 1 day | 3 years 10 months 28 days | 4 years 6 months 4 days
Average Remaining Contractual Term, Exercisable as of June 30, 2012 | 3 years 7 months 10 days |  |
Average Remaining Contractual Term, Unvested as of June 30, 2012 | 5 years 11 months 9 days |  |
Aggregate Intrinsic Value, Outstanding Beginning Balance | $ 697,780 | $ 353,955 |
Aggregate Intrinsic Value, Outstanding Ending Balance | 2,576,857 | 697,780 | 353,955
Aggregate Intrinsic Value, Exercisable as of June 30, 2012 | 2,548,172 |  |
Aggregate Intrinsic Value, Unvested as of June 30, 2012 | $ 28,685 |  |

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c), d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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