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Stock-Based Compensation (Performance Based Restricted Stock Awards) (Details) - Performance-Based Restricted Stock
3 Months Ended
Mar. 31, 2017
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) 151,769
Awards granted (shares) 56,147
Stock issued (shares) (33,887)
Awards forfeited (shares) (3,205)
Non-vested awards outstanding ending balance (shares) 170,824