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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - SARs - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Number Of Shares, Outstanding Beginning Balance | 24,500 | 22,000 | 22,000 |
Number Of Shares, SARs granted | 4,500 | 4,500 | 4,500 |
Number Of Shares, SARS exercised | (4,000) |  | (2,000) |
Number Of Shares, Outstanding Ending Balance | 25,000 |  | 24,500 | 22,000
Number Of Shares, Exercisable as of September 30, 2017 | 22,750 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Number | 2,250 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Weighted Average Exercise Price, Outstanding Beginning Balance | $ 65.85 | $ 57.04 | $ 57.04 |
Weighted Average Exercise Price, SARs granted | 192.71 |  | 93.87 |
Weighted Average Exercise Price, SARS exercised | 36.38 |  | 32.00 |
Weighted Average Exercise Price, Outstanding Ending Balance | 93.40 |  | $ 65.85 | $ 57.04
Weighted Average Exercise Price, Exercisable as of September 30, 2017 | $ 83.58 |  |  |
Average Remaining Contractual Term, Outstanding Beginning Balance | 4 years 2 months 23 days |  | 3 years 10 months 6 days | 3 years 11 months 4 days
Average Remaining Contractual Term, Outstanding Ending Balance | 4 years 2 months 23 days |  | 3 years 10 months 6 days | 3 years 11 months 4 days
Average Remaining Contractual Term, Exercisable as of September 30, 2017 | 4 years |  |  |
Aggregate Intrinsic Value, Outstanding Beginning Balance | $ 836,640 | $ 945,055 | $ 945,055 |
Aggregate Intrinsic Value, Outstanding Ending Balance | 2,203,100 |  | $ 836,640 | $ 945,055
Aggregate Intrinsic Value, Exercisable as of September 30, 2017 | $ 2,203,100 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Unvested, Weighted Average Exercise Price | $ 192.71 |  |  |
Average Remaining Contractual Term, Exercisable as of September 30, 2017 | 6 years 7 months 17 days |  |  |
Aggregate Intrinsic Value, Exercisable as of September 30, 2017 | $ 0 |  |  |

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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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the 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=96867065&loc=d3e5070-113901 + Details
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