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SHARE-BASED AWARDS AND OPTIONS (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of compensation cost for share-based payment arrangements, 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, 2017				September 30, 2016				September 30, 2017				September 30, 2016
	(in thousands)
Share-based compensation expense	$	9,617			$	8,688			$	30,771			$	26,060
Income tax benefit	$	3,523			$	2,968			$	10,788			$	8,679

Schedule of changes in non-vested restricted stock awards activity

The following table summarizes the changes in unvested share-based awards for the nine months ended September 30, 2017:

	Shares			Weighted-Average Grant-Date Fair Value
	(in thousands)
Unvested at December 31, 2016	1,263				$49.55
Granted	611			71.77
Vested	(685	)		40.35
Forfeited	(71	)		60.36
Unvested at September 30, 2017	1,118				$66.74

Schedule of share-based compensation, stock options, activity

The following summarizes changes in stock option activity for the nine months ended September 30, 2017:

	Options			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
	(in thousands)					(years)		(in millions)
Outstanding at December 31, 2016	759			$37.51		6.0		$24.5
Granted	124			79.45
Exercised	(156	)		23.56
Outstanding at September 30, 2017	727			$47.67		6.6		$34.4
Options vested and exercisable at September 30, 2017	505			$36.49		5.6		$29.6

Schedule of share-based payment award, stock options, 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, 2017
Risk-free interest rate	1.99%
Expected volatility	30%
Dividend yield	0.06%
Expected term (years)	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.

+ References

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-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

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Tabular disclosure of the changes in outstanding nonvested shares.

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-Publisher FASB
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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.

+ 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

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-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

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-Publisher FASB
-Name Accounting Standards Codification
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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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-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

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