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SHARE-BASED AWARDS AND OPTIONS (Tables) | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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
| March 31, 2018 |  | March 31, 2017
| (in thousands)
Share-based compensation expense | $ | 14,898 |  |  | $ | 8,816 |
Income tax benefit | $ | 3,285 |  |  | $ | 3,065 |
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 three months ended March 31, 2018:
| Shares |  | Weighted-Average Grant-Date Fair Value
| (in thousands) |  |
Unvested at December 31, 2017 | 1,226 |  |  |  | $78.29 |
Granted | 367 |  |  | 114.68 |
Vested | (168 | ) |  | 77.15 |
Forfeited | (16 | ) |  | 82.91 |
Unvested at March 31, 2018 | 1,409 |  |  |  | $87.84 |
Schedule of Stock Option Activity | The following summarizes changes in stock option activity for the three months ended March 31, 2018:
| Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (years) |  | (in millions)
Outstanding at December 31, 2017 | 723 |  |  | $47.79 |  | 6.4 |  | $37.9
Granted | 103 |  |  | 114.7 |  |  |  |
Exercised | (23 | ) |  | 21.89 |  |  |  |
Outstanding at March 31, 2018 | 803 |  |  | $57.11 |  | 6.8 |  | $44.0
Options vested and exercisable at March 31, 2018 | 520 |  |  | $40.66 |  | 5.6 |  | $36.8
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:
| Three Months Ended
| March 31, 2018 |  | March 31, 2017
Risk-free interest rate | 2.60% |  | 1.99%
Expected volatility | 29% |  | 30%
Dividend yield | 0.04% |  | 0.06%
Expected term (years) | 5 |  | 5

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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