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SHARE-BASED AWARDS AND OPTIONS (Tables)

3 Months Ended

Mar. 31, 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
	March 31, 2017				March 31, 2016
	(in thousands)
Share-based compensation expense	$	8,816			$	7,047
Income tax benefit	$	3,065			$	2,344

Schedule of changes in non-vested restricted stock awards activity

The following table summarizes the changes in unvested share-based awards for the three months ended March 31, 2017:

	Shares			Weighted-Average Grant-Date Fair Value
	(in thousands)
Unvested at December 31, 2016	1,263				$49.55
Granted	441			79.47
Vested	(3	)		42.90
Forfeited	(24	)		56.74
Unvested at March 31, 2017	1,677				$57.30

Schedule of share-based compensation, stock options, activity

The following summarizes changes in unvested stock option activity for the three months ended March 31, 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	(52	)		23.68
Outstanding at March 31, 2017	831			$44.65			6.6		$29.9
Options vested and exercisable at March 31, 2017	449			$29.49			4.7		$23.0

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:

	Three Months Ended
	March 31, 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=6415400&loc=d3e5070-113901

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Tabular disclosure of the changes in outstanding nonvested shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ 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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ 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 (f)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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