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Incentive Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Plans, Amounts Recognized | Amounts recognized in the financial statements with respect to share-based plans are shown in the following table:
﻿ | Six Months Ended June 30,
(Thousands of dollars) | 2019 |  | 2018
Compensation charged against income before tax benefit | $ | 30,003 |  |  | 18,970 |
Related income tax benefit recognized in income | 4,387 |  |  | 2,463 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=109197908&loc=d3e5070-113901 + Details
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