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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Stock price on valuation date
$
50.15

Performance term (in years)
3.0

Quarterly dividends paid per share
$
0.4675

Expected dividend yield
3.7
%
Dividend discount factor
0.9010