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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - SARs - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward] |  |  |  |
Number Of Shares, Outstanding Beginning Balance | 36 | 30 | 30 |
Number Of Shares, SARs granted | 0 | 7 | 14 |
Number Of Shares, SARS exercised | (3) |  | (8) |
Number Of Shares, Outstanding Ending Balance | 33 |  | 36 | 30
Number Of Shares, Exercisable as of March 31, 2021 | 26 |  |  |
Number Of Shares, Unvested as of March 31, 2021 | 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 | $ 139.16 | $ 124.13 | $ 124.13 |
Weighted Average Exercise Price, SARs granted | 0 |  | 137.40 |
Weighted Average Exercise Price, SARS exercised | 68.70 |  | 75.75 |
Weighted Average Exercise Price, Outstanding Ending Balance | 145.47 |  | $ 139.16 | $ 124.13
Weighted Average Exercise Price, Exercisable as of March 31, 2021 | 146.55 |  |  |
Weighted Average Exercise Price, Unvested as of March 31, 2021 | $ 141.37 |  |  |
Average Remaining Contractual Term, Outstanding Beginning Balance | 4 years 5 months 26 days |  | 4 years 4 months 17 days | 3 years 6 months 10 days
Average Remaining Contractual Term, Outstanding Ending Balance | 4 years 5 months 26 days |  | 4 years 4 months 17 days | 3 years 6 months 10 days
Average Remaining Contractual Term, Exercisable as of March 31, 2021 | 4 years 10 days |  |  |
Average Remaining Contractual Term, Unvested as of March 31, 2021 | 6 years 2 months 26 days |  |  |
Aggregate Intrinsic Value, Outstanding Beginning Balance | $ 903 | $ 1,352 | $ 1,352 |
Aggregate Intrinsic Value, Outstanding Ending Balance | 910 |  | $ 903 | $ 1,352
Aggregate Intrinsic Value, Exercisable as of March 31, 2021 | 738 |  |  |
Aggregate Intrinsic Value, Unvested as of March 31, 2021 | $ 172 |  |  |

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