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Stock-Based Compensation (tables)
6 Months Ended
Jun. 30, 2013
Share-based Compensation [Abstract]  
LTIP Assumptions [Table Text Block]
Stock price on valuation date
$
45.38

Performance term (in years)
3.0

Quarterly dividends paid per share
$
0.455

Expected dividend yield
3.9
%
Dividend discount factor
0.8943