Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The Company calculated the fair value for options with the following weighted-average assumptions for 2017, 2016, and 2015:

	December 31,
	2017		2016		2015
Risk-free interest rate	2.23	%	1.54	%	2.00	%
Dividend yield	0.5	%	0.6	%	0.6	%
Volatility factors	37.6	%	48.5	%	48.8	%
Weighted-average expected life	8.0 years		8.0 years		8.0 years