Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Deferred Compensation Arrangements [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair value of each grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:

	2016	2015
Dividend yield	5.9%	4.7%
Expected volatility	19.1%	17.8%
Expected lives	2.9 years	2.8 years
Risk-free interest rate	0.91%	0.98%

Schedule of Stock Option Activity

The following table summarizes our outstanding stock options:

	Six Months Ended
	June 30,
	2016		2015
Options outstanding January 1,	741,676		871,671
Options granted under 2012 Plan	470,000		450,000
Options granted under 2005 Plan	—		20,000
Options exercised under 2012 Plan	(451,668	)	(421,657	)
Options exercised under 2005 Plan	—		(50,002	)
Options outstanding, June 30,	760,008		870,012
Exercisable at June 30,	406,660		596,664