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Stock-Based Compensation (Details 2) (Performance Shares [Member], USD $)
9 Months Ended
Sep. 30, 2014
Performance Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding at January 1, 2014 87,194
Shares, Granted at target 85,078
Shares, Forfeited (1,419)
Shares, Outstanding at September 30, 2014 170,853
Weighted-Average Grant Date Fair Value, Outstanding at January 1, 2014 $ 21.29
Weighted-Average Grant Date Fair Value, Granted at target $ 27.69
Weighted-Average Grant Date Fair Value, Forfeited $ 23.55
Weighted-Average Grant Date Fair Value, Outstanding at September 30, 2014 $ 24.46