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Earnings Per Common Share and Share Awards Summary Of Share-Based Award Transactions (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Number Of Shares, Options exercised |  | (1,500) | (1,000) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Weighted Average Exercise Price, Options exercised |  | $ 36.79 | $ 27.21 |
StockOptionsAndStockAppreciationRightsSARS |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Number Of Shares, Outstanding Beginning Balance | 22,000 | 21,000 | 19,000 |
Number Of Shares, Outstanding Ending Balance | 24,500 | 22,000 | 21,000 | 19,000
Number Of Shares, Exercisable as of December 31, 2016 | 23,375 |  |  |
Number Of Shares, Unvested as of December 31, 2016 | 1,125 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Weighted Average Exercise Price, Outstanding Beginning Balance | $ 57.04 | $ 51.30 | $ 45.74 |
Weighted Average Exercise Price, Outstanding Ending Balance | 65.85 | $ 57.04 | $ 51.30 | $ 45.74
Weighted Average Exercise Price, Exercisable as of December 31, 2016 | 64.50 |  |  |
Weighted Average Exercise Price, Unvested as of December 31, 2016 | $ 93.87 |  |  |
Average Remaining Contractual Term, Outstanding Beginning Balance | 3 years 10 months 6 days | 3 years 11 months 4 days | 3 years 7 months 20 days | 3 years 5 months 4 days
Average Remaining Contractual Term, Exercisable as of December 31, 2016 | 3 years 8 months 23 days |  |  |
Average Remaining Contractual Term, Unvested as of December 31, 2016 | 6 years 4 months 17 days |  |  |
Aggregate Intrinsic Value, Outstanding Beginning Balance | $ 945,055 | $ 453,510 | $ 669,610 |
Aggregate Intrinsic Value, Outstanding Ending Balance | 836,640 | $ 945,055 | $ 453,510 | $ 669,610
Aggregate Intrinsic Value, Exercisable as of December 31, 2016 | 829,744 |  |  |
Aggregate Intrinsic Value, Unvested as of December 31, 2016 | $ 6,896 |  |  |
SARs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Number Of Shares, SARs granted | 4,500 | 4,500 | 4,500 |
Number Of Shares, Options exercised | (2,000) | (2,000) | (1,500) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Weighted Average Exercise Price, SARs granted | $ 93.87 | $ 73.00 | $ 68.70 |
Weighted Average Exercise Price, Options exercised | $ 32.00 | $ 47.88 | $ 49.04 |

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