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SHARE-BASED AWARDS AND OPTIONS (Tables)

3 Months Ended

Mar. 31, 2019

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, 2019				March 31, 2018
	(in thousands)
Share-based compensation expense	$	11,418			$	14,898
Income tax benefit	$	2,509			$	3,285

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, 2019:

	Shares			Weighted-Average Grant-Date Fair Value
	(in thousands)
Unvested at December 31, 2018	1,084				$108.51
Granted	458			133.13
Vested	(226	)		92.19
Forfeited	(28	)		99.65
Unvested at March 31, 2019	1,288				$120.33

Schedule of Stock Option Activity

The following table summarizes changes in stock option activity for the three months ended March 31, 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
Granted	109			128.22
Forfeited	—			—
Exercised	(170	)		35.91
Outstanding at March 31, 2019	537				$80.59			7.1		$30.0
Options vested and exercisable at March 31, 2019	319				$58.70			5.7		$24.8

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, 2019		March 31, 2018
Risk-free interest rate	2.49%		2.60%
Expected volatility	30%		29%
Dividend yield	0.04%		0.04%
Expected term (years)	5		5

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Tabular disclosure of the changes in outstanding nonvested shares.

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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.

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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.

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