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Shareholders' Equity - Stock Options Activity (Details) - 2012 Equity Incentive Plan - Stock options - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Stock Options        
Outstanding at beginning of the period (in shares) 2,826,500 2,484,400 2,484,400  
Granted (in shares) 385,200 698,000    
Exercised (in shares) (28,250) (105,750)    
Forfeited (in shares) (50,000) (95,650)    
Outstanding at end of the period (in shares) 3,133,450 2,981,000 2,826,500 2,484,400
Exercisable at end of the period (in shares) 1,716,000 1,117,625    
Weighted Average Exercise Price        
Outstanding at beginning of the period (in dollars per share) $ 15.69 $ 16.22 $ 16.22  
Granted (in dollars per share) 23.38 14.04    
Exercised (in dollars per share) 15.96 15.92    
Forfeited (in dollars per share) 16.38 16.35    
Outstanding at end of the period (in dollars per share) 16.62 15.71 $ 15.69 $ 16.22
Exercisable at end of the period (in dollars per share) $ 15.89 $ 16.07    
Aggregate intrinsic value        
Weighted average remaining life (in years) 7 years 3 months 29 days 7 years 10 months 24 days 7 years 7 months 6 days 8 years
Weighted average exercisable (in years) 6 years 6 months 11 days 7 years 2 months 12 days    
Aggregate intrinsic value $ 18,940 $ 14,211 $ 14,956 $ 1,225
Aggregate intrinsic value exercised 196 298    
Aggregate intrinsic value exercisable $ 11,468 $ 4,934