Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Summary of Assumptions for Options Granted

A summary of assumptions for options granted in each of the three years 2014 through 2016 is as follows:

	2016		2015		2014
Volatility factor	19.2	%	23.6	%	30.9	%
Dividend yield	1.1	%	0.9	%	0.9	%
Expected term (in years)	5.78		5.66		5.65
Risk-free rate	1.3	%	1.6	%	1.9	%