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SHARE-BASED AWARDS AND OPTIONS (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Compensation Cost , 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:
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
| (in thousands)
Share-based compensation expense | $ | 89,634 |  |  | $ | 57,826 |  |  | $ | 39,095 |
Income tax benefit | $ | 20,519 |  |  | $ | 13,038 |  |  | $ | 13,849 |
Schedule of Changes in Non-Vested Restricted Stock Awards Activity | The following table summarizes the changes in unvested restricted stock awards and performance units for the years ended December 31, 2019, 2018 and 2017:
|  | Shares |  | Weighted-Average Grant-Date Fair Value
|  | (in thousands) |  |
Unvested at December 31, 2016 |  | 1,263 |  |  | $49.55
Granted |  | 899 |  |  | 79.79 |
Vested |  | (858 | ) |  | 39.26 |
Forfeited |  | (78 | ) |  | 59.56 |
Unvested at December 31, 2017 |  | 1,226 |  |  | 78.29 |
Granted |  | 650 |  |  | 109.85 |
Vested |  | (722 | ) |  | 60.08 |
Forfeited |  | (70 | ) |  | 91.47 |
Unvested at December 31, 2018 |  | 1,084 |  |  | 108.51 |
Replacement Awards |  | 894 |  |  | 163.74 |
Granted |  | 784 |  |  | 142.26 |
Vested |  | (781 | ) |  | 105.04 |
Forfeited |  | (137 | ) |  | 124.30 |
Unvested at December 31, 2019 |  | 1,844 |  |  | $149.96
Schedule of Share-based Compensation, Stock Options, Activity | The following table summarizes changes in stock option activity for the years ended December 31, 2019, 2018 and 2017:
| Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (years) |  | (in millions)
Outstanding at December 31, 2016 | 759 |  |  | $37.51 |  | 6.0 |  | $24.5
Granted | 124 |  |  | 79.45 |  |  |  |  |
Exercised | (160 | ) |  | 23.50 |  |  |  |  | 10.1 |
Outstanding at December 31, 2017 | 723 |  |  | 47.79 |  |  | 6.4 |  | 37.9 |
Granted | 103 |  |  | 114.70 |  |  |  |  |
Forfeited | (22 | ) |  | 100.38 |  |  |  |  |
Exercised | (206 | ) |  | 42.65 |  |  |  |  | 16.5 |
Outstanding at December 31, 2018 | 598 |  |  | 59.16 |  |  | 6.2 |  | 27.3 |
Replacement Awards | 1,336 |  |  | 68.96 |  |  |  |  |
Granted | 109 |  |  | 128.22 |  |  |  |  |
Forfeited | (23 | ) |  | 110.13 |  |  |  |  |
Exercised | (265 | ) |  | 33.99 |  |  |  |  | 28.8 |
Outstanding at December 31, 2019 | 1,755 |  |  | $74.06 |  | 6.5 |  | $190.3
Options vested and exercisable at December 31, 2019 | 1,167 |  |  | $58.03 |  | 5.6 |  | $145.3
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | Fair value was estimated on the date of grant using the Black-Scholes valuation model with the following weighted-average assumptions:
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
Risk-free interest rate | 1.72 | % |  | 2.60 | % |  | 1.99 | %
Expected volatility | 31 | % |  | 29 | % |  | 30 | %
Dividend yield | 0.04 | % |  | 0.04 | % |  | 0.06 | %
Expected term (years) | 5 |  |  | 5 |  |  | 5 |

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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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