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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward] |  |  |  |  |  |  |
Number Of Shares, SARs granted | 4 | 7 | 4 |  |  |  |
SARs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward] |  |  |  |  |  |  |
Number Of Shares, Outstanding Beginning Balance |  | 30 |  | 28 | 30 | 28 |
Number Of Shares, SARs granted |  |  |  | 0 | 11 | 4 |
Number Of Shares, SARS exercised |  |  |  |  | (8) | (2) |
Number Of Shares, Outstanding Ending Balance |  |  |  |  | 33 | 30 | 28
Number Of Shares, Exercisable as of September 30, 2020 |  |  |  |  | 26 |  |
Number Of Shares, Unvested as of September 30, 2020 |  |  |  |  | 7 |  |
Share-based Compensation Arrangement by Share-based Payment Award, SARs, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |  |  |  |
Weighted Average Exercise Price, Outstanding Beginning Balance |  | $ 124.13 |  | $ 110.27 | $ 124.13 | $ 110.27 |
Weighted Average Exercise Price, SARs granted |  |  |  |  | 135.05 | 162.81 |
Weighted Average Exercise Price, SARS exercised |  |  |  |  | 75.75 | 50.50 |
Weighted Average Exercise Price, Outstanding Ending Balance |  |  |  |  | 138.55 | $ 124.13 | $ 110.27
Weighted Average Exercise Price, Exercisable as of September 30, 2020 |  |  |  |  | 140.02 |  |
Weighted Average Exercise Price, Unvested as of September 30, 2020 |  |  |  |  | $ 133.21 |  |
Average Remaining Contractual Term, Outstanding Beginning Balance |  |  |  |  | 4 years 4 months 28 days | 3 years 6 months 10 days | 3 years 7 months 20 days
Average Remaining Contractual Term, Outstanding Ending Balance |  |  |  |  | 4 years 4 months 28 days | 3 years 6 months 10 days | 3 years 7 months 20 days
Average Remaining Contractual Term, Exercisable as of September 30, 2020 |  |  |  |  | 3 years 9 months 29 days |  |
Average Remaining Contractual Term, Unvested as of September 30, 2020 |  |  |  |  | 6 years 6 months 7 days |  |
Aggregate Intrinsic Value, Outstanding Beginning Balance |  | $ 1,352 |  | $ 2,019 | $ 1,352 | $ 2,019 |
Aggregate Intrinsic Value, Outstanding Ending Balance |  |  |  |  | 496 | $ 1,352 | $ 2,019
Aggregate Intrinsic Value, Exercisable as of September 30, 2020 |  |  |  |  | 480 |  |
Aggregate Intrinsic Value, Unvested as of September 30, 2020 |  |  |  |  | $ 16 |  |

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