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Share-Based Compensation - Restricted Stock Activity (Details) - Restricted Stock - $ / shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Number of Restricted Stock Awards (in thousands)    
Beginning balance (in shares) 0  
Granted (in shares) 1,000 0
Vested (in shares) 0  
Ending balance (in shares) 1,000  
Weighted Average Grant Date Fair Value    
Beginning balance (in usd per share) $ 0.00  
Granted (in usd per share) 12.00  
Vested (in usd per share) 12.00  
Ending balance (in usd per share) $ 12.00