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Stock-Based Compensation (Nonvested Restricted Shares Activity) (Details) - Restricted Stock [Member] - $ / shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Nonvested shares, beginning balance 464,661  
Nonvested shares, forfeited (37,666) (6,333)
Nonvested shares, ending balance 426,995  
Nonvested, weighted average grant date fair value, beginning balance $ 2.03  
Nonvested, weighted average grant date fair value, forfeited 2.20  
Nonvested, weighted average grant date fair value, ending balance $ 2.01