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SHARE-BASED AWARDS AND OPTIONS (Tables)

6 Months Ended

Jun. 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								Six Months Ended
	June 30, 2017				June 30, 2016				June 30, 2017				June 30, 2016
	(in thousands)
Share-based compensation expense	$	12,337			$	10,325			$	21,153			$	17,372
Income tax benefit	$	4,199			$	3,367			$	7,265			$	5,711

Schedule of changes in non-vested restricted stock awards activity

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

	Shares			Weighted-Average Grant-Date Fair Value
	(in thousands)
Unvested at December 31, 2016	1,263				$49.55
Granted	490			80.21
Vested	(34	)		60.89
Forfeited	(54	)		58.22
Unvested at June 30, 2017	1,665				$58.05

Schedule of share-based compensation, stock options, activity

The following summarizes changes in unvested stock option activity for the six months ended June 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
Forfeited	—			—
Exercised	(122	)		22.03
Outstanding at June 30, 2017	761			$46.79			6.7		$33.2
Options vested and exercisable at June 30, 2017	381			$31.05			4.8		$22.6

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:

	Six Months Ended
	June 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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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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