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Stock-Based Compensation (Deferred Stock Units) (Details) - Deferred Stock Units [Member]
9 Months Ended
Sep. 30, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-vested awards outstanding beginning balance (shares) 30,150
Awards granted (shares) 9,100
Stock issued (shares) (15,400)
Non-vested awards outstanding ending balance (shares) 23,850