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Equity Compensation (Performance Based Restricted Stock Awards) (Details) - Performance-Based Restricted Stock
6 Months Ended
Jun. 30, 2018
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) 169,202
Awards granted (shares) 72,160
Stock issued (shares) (81,230)
Awards forfeited (shares) (17,489)
Non-vested awards outstanding ending balance (shares) 142,643