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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2019

STOCK-BASED COMPENSATION

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

		Three-Months Ended March 31,
		2019		2018
Dividend yield		0.0	%	0.0	%
Expected volatility		30.2	%	34.9	%
Risk-free interest rate		2.4	%	2.8	%
Expected term		6.0	years	6.0	years

Summary of activities with respect to its stock option plans

							Weighted-
				Weighted-			Average
				Average			Remaining
		Number of		Exercise			Contractual		Aggregate
		Shares (in		Price Per			Term (in		Intrinsic
Options		thousands)		Share			years)		Value
Outstanding at January 1, 2019		18,890		$	34.61		5.8		$	303,627
Granted 01/01/19 - 03/31/19		1,570		$	59.52
Exercised		(3,627)		$	9.69
Cancelled or forfeited		(158)		$	50.86
Outstanding at March 31, 2019		16,675		$	42.23		6.9		$	224,846
Vested and expected to vest in the future at March 31, 2019		15,564		$	41.40		6.8		$	221,040
Exercisable at March 31, 2019		8,680		$	33.49		5.6		$	184,608

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

				Weighted
		Number of		Average
		Shares (in		Grant-Date
		thousands)		Fair Value
Non-vested at January 1, 2019		529		$	51.55
Granted 01/01/19 - 03/31/19		548		$	59.66
Vested		(244)		$	49.91
Forfeited/cancelled		—		$	—
Non-vested at March 31, 2019		833		$	57.36

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- Definition

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
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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=96867065&loc=d3e5070-113901

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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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