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SHARE-BASED AWARDS AND OPTIONS (Tables)

6 Months Ended

Jun. 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								Six Months Ended
	June 30, 2019				June 30, 2018				June 30, 2019				June 30, 2018
	(in thousands)
Share-based compensation expense	$	16,496			$	15,205			$	27,914			$	30,104
Income tax benefit	$	3,728			$	3,377			$	6,237			$	6,662

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 six months ended June 30, 2019:

	Shares			Weighted-Average Grant-Date Fair Value
	(in thousands)
Unvested at December 31, 2018	1,084				$108.51
Granted	475			133.58
Vested	(260	)		94.78
Forfeited	(62	)		107.74
Unvested at June 30, 2019	1,237				$121.06

Schedule of Stock Option Activity

The following table summarizes changes in stock option activity for the six months ended June 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
Granted	109			128.22
Exercised	(193	)		34.01
Outstanding at June 30, 2019	514				$83.31			7.1		$39.5
Options vested and exercisable at June 30, 2019	296				$61.73			5.8		$29.1

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:

	Six Months Ended
	June 30, 2019		June 30, 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 cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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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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