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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number Of Shares, Options exercised | (2,650) | (6,380) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |
Weighted Average Exercise Price, Options exercised | $ 28.63 | $ 25.17 |
StockOptionsAndStockAppreciationRightsSARS [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number Of Shares, Outstanding Beginning Balance | 98,150 | 101,600 |
Number Of Shares, Options/SARs cancelled/forfeited/expired | 0 | (70) |
Number Of Shares, Outstanding Ending Balance | 19,000 | 98,150 | 101,600
Number Of Shares, Exercisable as of September 30, 2013 | 17,500 |  |
Number Of Shares, Unvested as of September 30. 2013 | 1,500 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |
Weighted Average Exercise Price, Outstanding Beginning Balance | $ 30.74 | $ 29.81 |
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired | $ 0.00 | $ 31.00 |
Weighted Average Exercise Price, Outstanding Ending Balance | $ 45.74 | $ 30.74 | $ 29.81
Weighted Average Exercise Price, Exercisable as of September 30, 2013 | $ 43.52 |  |
Weighted Average Exercise Price, Unvested as of September 30, 2013 | $ 71.59 |  |
Average Remaining Contractual Term, Outstanding Beginning Balance | 3 years 8 months 4 days | 3 years 2 months 1 day | 3 years 10 months 28 days
Average Remaining Contractual Term, Outstanding Ending Balance | 3 years 8 months 4 days | 3 years 2 months 1 day | 3 years 10 months 28 days
Average Remaining Contractual Term, Exercisable as of September 30, 2013 | 3 years 5 months 4 days |  |
Average Remaining Contractual Term, Unvested as of September 30, 2013 | 6 years 7 months 17 days |  |
Aggregate Intrinsic Value, Outstanding Beginning Balance | $ 2,871,710 | $ 697,780 |
Aggregate Intrinsic Value, Outstanding Ending Balance | 557,890 | 2,871,710 | 697,780
Aggregate Intrinsic Value, Exercisable as of September 30, 2013 | 552,625 |  |
Aggregate Intrinsic Value, Unvested as of September 30, 2013 | $ 5,265 |  |
SARs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number Of Shares, SARs granted | 3,000 | 3,000 |
Number Of Shares, Options exercised | (79,500) | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |
Weighted Average Exercise Price, SARs granted | $ 71.59 | $ 50.50 |
Weighted Average Exercise Price, Options exercised | $ 28.77 | $ 0.00 |

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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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