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Share-Based Compensation (Restricted Stock) (Details) - Restricted stock awards - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restricted Stock Awards    
Vested (in shares) 0 (4,009)
Forfeited (in shares) 0 0
Minimum    
Restricted Stock Awards    
Vesting period 6 months  
Maximum    
Restricted Stock Awards    
Vesting period 24 months