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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number Of Shares, Options exercised |  | (1,500) |
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 |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Number | 3,375 |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Weighted Average Exercise Price | $ 93.87 |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Weighted Average Remaining Contractual Term | 6 years 10 months 17 days |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Intrinsic Value | $ 4,658 |  |
StockOptionsAndStockAppreciationRightsSARS [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number Of Shares, Outstanding Beginning Balance | 22,000 | 21,000 |
Number Of Shares, Outstanding Ending Balance | 24,500 | 22,000 | 21,000
Number Of Shares, Exercisable as of June 30, 2016 | 21,125 |  |
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 |
Weighted Average Exercise Price, Outstanding Ending Balance | 65.85 | $ 57.04 | $ 51.30
Weighted Average Exercise Price, Exercisable as of June 30, 2016 | $ 61.38 |  |
Average Remaining Contractual Term, Outstanding Beginning Balance | 4 years 4 months 6 days | 3 years 11 months 4 days | 3 years 7 months 20 days
Average Remaining Contractual Term, Outstanding Ending Balance | 4 years 4 months 6 days | 3 years 11 months 4 days | 3 years 7 months 20 days
Average Remaining Contractual Term, Exercisable as of June 30, 2016 | 3 years 11 months 12 days |  |
Aggregate Intrinsic Value, Outstanding Beginning Balance | $ 945,055 | $ 453,510 |
Aggregate Intrinsic Value, Outstanding Ending Balance | 720,265 | $ 945,055 | $ 453,510
Aggregate Intrinsic Value, Exercisable as of June 30, 2016 | $ 715,607 |  |
SARs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number Of Shares, SARs granted | 4,500 | 4,500 |
Number Of Shares, Options exercised | (2,000) | (2,000) |
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 |
Weighted Average Exercise Price, Options exercised | $ 32.00 | $ 47.88 |

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