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Earnings Per Common Share and Summary of Share-Based Award Transactions (Details) - SARs - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward] |  |  |
Number Of Shares, Outstanding Beginning Balance | 30 | 28 |
Number Of Shares, SARs granted | 14 | 4 |
Number Of Shares, SARs exercised | (8) | (2) |
Number Of Shares, Outstanding Ending Balance | 36 | 30 | 28
Number Of Shares, Exercisable as of December 31, 2020 | 27 |  |
Number Of Shares, Unvested as of December 31, 2020 | 9 |  |
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 |
Weighted Average Exercise Price, SARs granted | 137.40 | 162.81 |
Weighted Average Exercise Price, SARs exercised | 75.75 | 50.50 |
Weighted Average Exercise Price, Outstanding Ending Balance | 139.16 | $ 124.13 | $ 110.27
Weighted Average Exercise Price, Exercisable as of December 31, 2020 | 139.31 |  |
Weighted Average Exercise Price, Unvested as of December 31, 2020 | $ 138.70 |  |
Average Remaining Contractual Term, Outstanding Beginning Balance | 4 years 4 months 17 days | 3 years 6 months 10 days | 3 years 7 months 20 days
Average Remaining Contractual Term, Exercisable as of December 31, 2020 | 3 years 8 months 8 days |  |
Average Remaining Contractual Term, Unvested as of December 31, 2020 | 6 years 5 months 8 days |  |
Aggregate Intrinsic Value, Outstanding Beginning Balance | $ 1,352 | $ 2,019 |
Aggregate Intrinsic Value, Outstanding Ending Balance | 903 | $ 1,352 | $ 2,019
Aggregate Intrinsic Value, Exercisable as of December 31, 2020 | 772 |  |
Aggregate Intrinsic Value, Unvested as of December 31, 2020 | $ 131 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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