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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Assumptions used in option pricing model and grant date fair value of options

We used the following inputs to the Black-Scholes option-pricing model to estimate the fair value of each option granted in 2015 and 2016.

	Weighted-average
	2015				2016
Grant-date fair value per option awarded	$	17.35			$	10.62
Assumptions used:
Expected life in years	7.0				6.8
Expected volatility	27		%		20		%
Dividend yield	2.4		%		2.5		%
Risk-free interest rate	1.9		%		1.6		%

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- Definition

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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