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SHARE-BASED AWARDS AND STOCK OPTIONS (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Allocation of Share-Based Compensation Costs by Plan | The following table summarizes share-based compensation expense and the related income tax benefit recognized for our share-based awards and stock options:
| Three Months Ended |  | Nine Months Ended
| September 30, 2019 |  | September 30, 2018 |  | September 30, 2019 |  | September 30, 2018
| (in thousands)
Share-based compensation expense | $ | 27,877 |  |  | $ | 14,833 |  |  | $ | 55,791 |  |  | $ | 44,937 |
Income tax benefit | $ | 4,396 |  |  | $ | 3,614 |  |  | $ | 10,633 |  |  | $ | 10,276 |
Schedule of Changes in Non-Vested Restricted Stock Awards Activity | The following table summarizes the changes in unvested restricted stock and performance awards for the nine months ended September 30, 2019:
| Shares |  | Weighted-Average Grant-Date Fair Value
| (in thousands) |  |
Unvested at December 31, 2018 | 1,084 |  |  |  | $108.51 |
Replacement Awards | 894 |  |  | 163.74 |
Granted | 772 |  |  | 141.42 |
Vested | (490 | ) |  | 71.92 |
Forfeited | (88 | ) |  | 112.47 |
Unvested at September 30, 2019 | 2,172 |  |  |  | $151.06 |
Schedule of Stock Option Activity | The following table summarizes changes in stock option activity for the nine months ended September 30, 2019:
| Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (years) |  | (in millions)
Outstanding at December 31, 2018 | 598 |  |  |  | $59.16 |  |  | 6.2 |  | $27.3
Replacement Awards | 1,336 |  |  | 68.96 |  |  |  |  |
Granted | 109 |  |  | 128.22 |  |  |  |  |
Exercised | (221 | ) |  | 32.54 |  |  |  |  |
Outstanding at September 30, 2019 | 1,822 |  |  |  | $73.71 |  |  | 6.8 |  | $155.4
Options vested and exercisable at September 30, 2019 | 1,217 |  |  |  | $57.29 |  |  | 5.9 |  | $123.7
Schedule of Stock Option Valuation Assumptions | Fair value was estimated on the date of grant using the Black-Scholes valuation model with the following weighted-average assumptions:
| Nine Months Ended
| September 30, 2019 |  | September 30, 2018
Risk-free interest rate | 1.72% |  | 2.60%
Expected volatility | 31% |  | 29%
Dividend yield | 0.04% |  | 0.04%
Expected term (years) | 5 |  | 5

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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