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Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | Additional disclosures for time-based RSAs and time-based RSUs:
| Year Ended December 31,
| 2020 | 2019 | 2018
Weighted average grant date fair value of awards granted | $ | 66.32 |  | $ | 124.04 |  | $ | 65.98 |
Fair value of awards vested during the year (in millions) | 18.1 |  | 39.7 |  | 1.2 |
Share-based Payment Arrangement, Cost by Plan | Stock-based compensation expense and other disclosures for stock-based awards follows:
| Year Ended December 31,
(in thousands) | 2020 | 2019 | 2018
Stock-based compensation expense recognized | $ | 60,145 |  | $ | 23,993 |  | $ | 20,425 |
Income tax benefit realized from stock-based compensation expense | 16,217 |  | 4,876 |  | 5,249 |
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of time-based restricted stock awards and time-based restricted stock units activity | Following is a summary of time-based RSAs and time-based RSUs award activity for 2020:
| Total Awards (in thousands) | Weighted Average Grant Date Fair Value
Non-vested - December 31, 2019 | 443 |  | $ | 86.10 |
Granted | 468 |  | 66.32 |
Vested | (262) |  | 70.65 |
Canceled | (13) |  | 79.89 |
Non-vested - December 31, 2020 | 636 |  | $ | 78.04 |
Performance Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of LTIP awards activity | The following is a summary of LTIP award activity, at 100% of targeted amount, for 2020:
| Number of Performance Units (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2019 | 272 |  |  | $ | 79.95 |
Granted | 113 |  |  | 70.05 |
Vested | (115) |  |  | 48.06 |
Unvested at December 31, 2020 | 270 |  |  | $ | 89.40 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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