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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2015
Share-based Compensation [Abstract]  
LTIP Assumptions [Table Text Block]
Stock price on valuation date
$
47.64

Performance term (in years)
3.0

Quarterly dividends paid per share
$
0.465

Expected dividend yield
3.8
%
Dividend discount factor
0.8966