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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2018

STOCK-BASED COMPENSATION

Schedule of weighted-average assumptions used to estimate the fair value of options granted

		Three-Months Ended September 30,				Nine-Months Ended September 30,
		2018		2017		2018		2017
Dividend yield		0.0%		0.0%		0.0%		0.0%
Expected volatility		34.5%		35.3%		34.9%		36.6%
Risk-free interest rate		2.9%		1.7%		2.8%		2.1%
Expected term		6.1 years		5.9 years		6.1 years		6.1 years

Summary of Company's activities with respect to its stock option plans

Options		Number of Shares (in thousands)		Weighted- Average Exercise Price Per Share			Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding at January 1, 2018		17,819		$	29.62		6.1		$	600,032
Granted 01/01/18 - 03/31/18		2,615		$	58.76
Granted 04/01/18 - 06/30/18		360		$	51.72
Granted 07/01/18 - 09/30/18		11		$	58.77
Exercised		(1,308)		$	18.71
Cancelled or forfeited		(495)		$	43.71
Outstanding at September 30, 2018		19,002		$	34.45		6.1		$	454,476
Vested and expected to vest in the
future at September 30, 2018		18,061		$	33.59		5.9		$	447,291
Exercisable at September 30, 2018		10,179		$	22.51		4.3		$	364,103

Summary of Company's activities with respect to non-vested restricted stock units

		Number of Shares (in thousands)		Weighted Average Grant-Date Fair Value
Non-vested at January 1, 2018		530		$	45.09
Granted 01/01/18- 03/31/18		221		$	58.75
Granted 04/01/18- 06/30/18		48		$	52.31
Granted 07/01/18 - 09/30/18		1		$	58.72
Vested		(263)		$	45.36
Forfeited/cancelled		(7)		$	33.60
Non-vested at September 30, 2018		530		$	51.48

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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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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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