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Shareholders' Equity - Stock Options Activity (Details) - 2012 Equity Incentive Plan - Stock options - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 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) 385,200 688,000    
Exercised (in shares) (16,000) (22,500)    
Forfeited (in shares) (5,000) (32,150)    
Outstanding at end of the period (in shares) 3,190,700 3,117,750 2,826,500 2,484,400
Exercisable at end of the period (in shares) 1,660,750 1,137,125    
Weighted Average Exercise Price        
Outstanding at beginning of the period (in USD per share) $ 15.69 $ 16.22 $ 16.22  
Granted (in USD per share) 23.38 14.02    
Exercised (in USD per share) 16.07 15.00    
Forfeited (in USD per share) 16.48 16.70    
Outstanding at end of the period (in USD per share) 16.62 15.74 $ 15.69 $ 16.22
Exercisable at end of the period (in USD per share) $ 15.84 $ 16.02    
Aggregate intrinsic value        
Weighted average remaining life (years) 7 years 7 months 25 days 8 years 3 months 18 days 7 years 7 months 6 days 8 years
Weighted average exercisable (years) 6 years 10 months 10 days 7 years 5 months 16 days    
Aggregate intrinsic value $ 20,404 $ 1,711 $ 14,956 $ 1,225
Aggregate intrinsic value exercised 117 13    
Aggregate intrinsic value exercisable $ 11,824 $ 314