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Share-Based Compensation - Summary of Restricted Stock Activity (Details) - Restricted Stock - $ / shares
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Shares    
December 31, 2015 (in shares) 40,000  
Granted (in shares) 44,000 25,000
Vested (in shares) (9,000)  
Forfeited (in shares) (1,000)  
September 30, 2016 (in shares) 74,000  
Weighted Average Grant Date Fair Value    
December 31, 2015 (in dollars per share) $ 29.10  
Granted (in dollars per share) 34.14 $ 30.30
Vested (in dollars per share) 28.76  
Forfeited (in dollars per share) 34.14  
September 30, 2016 (in dollars per share) $ 32.09