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Stock-Based Compensation (Performance Based Restricted Stock Awards) (Details) - Performance-Based Restricted Stock
6 Months Ended
Jun. 30, 2016
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) 107,229
Awards granted (shares) 81,220
Stock issued (shares) (25,397)
Awards forfeited (shares) (8,401)
Non-vested awards outstanding ending balance (shares) 154,651