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SHARE-BASED AWARDS AND OPTIONS (Tables)

6 Months Ended

Jun. 30, 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								Six Months Ended
	June 30, 2018				June 30, 2017				June 30, 2018				June 30, 2017
	(in thousands)
Share-based compensation expense	$	15,205			$	12,337			$	30,104			$	21,153
Income tax benefit	$	3,377			$	4,199			$	6,662			$	7,265

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, 2018:

	Shares			Weighted-Average Grant-Date Fair Value
	(in thousands)
Unvested at December 31, 2017	1,226				$78.29
Granted	485			114.78
Vested	(203	)		75.77
Forfeited	(26	)		85.67
Unvested at June 30, 2018	1,482				$90.43

Schedule of Stock Option Activity

The following summarizes changes in stock option activity for the six months ended June 30, 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			114.70
Forfeited	(4	)		19.64
Exercised	(49	)		21.85
Outstanding at June 30, 2018	773				$58.45			6.8		$41.3
Options vested and exercisable at June 30, 2018	491				$41.79			5.7		$34.2

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, 2018		June 30, 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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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
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-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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