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SHARE-BASED AWARDS AND OPTIONS (Tables)

9 Months Ended

Sep. 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								Nine Months Ended
	September 30, 2018				September 30, 2017				September 30, 2018				September 30, 2017
	(in thousands)
Share-based compensation expense	$	14,833			$	9,617			$	44,937			$	30,771
Income tax benefit	$	3,614			$	3,523			$	10,276			$	10,788

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 nine months ended September 30, 2018:

	Shares			Weighted-Average Grant-Date Fair Value
	(in thousands)
Unvested at December 31, 2017	1,226				$78.29
Granted	600			107.16
Vested	(715	)		62.89
Forfeited	(55	)		90.40
Unvested at September 30, 2018	1,056			$104.52

Schedule of Stock Option Activity

The following summarizes changes in stock option activity for the nine months ended September 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	(9	)		81.68
Exercised	(188	)		39.40
Outstanding at September 30, 2018	629				$60.75			6.1		$41.8
Options vested and exercisable at September 30, 2018	457				$47.50			5.1		$36.5

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:

	Nine Months Ended
	September 30, 2018		September 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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-Name Accounting Standards Codification
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-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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