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Stock Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation Expense and Related Tax Benefits | Stock-based compensation expense and related tax benefits were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(DOLLARS IN THOUSANDS) | 2019 |  | 2018 |  | 2019 |  | 2018
Equity-based awards | $ | 10,696 |  |  | $ | 7,554 |  |  | $ | 18,300 |  |  | $ | 15,174 |
Liability-based awards | 2,061 |  |  | 242 |  |  | 2,791 |  |  | 397 |
Total stock-based compensation expense | 12,757 |  |  | 7,796 |  |  | 21,091 |  |  | 15,571 |
Less: Tax benefit | (2,141 | ) |  | (1,335 | ) |  | (3,523 | ) |  | (2,898 | )
Total stock-based compensation expense, after tax | $ | 10,616 |  |  | $ | 6,461 |  |  | $ | 17,568 |  |  | $ | 12,673 |

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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=116856206&loc=d3e5070-113901 + Details
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