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Shareholders' Equity (Details 3) - 2012 Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Stock options        
Stock Options        
Outstanding at beginning of the period (in shares) 2,165,000 1,190,000 1,190,000  
Granted (in shares) 588,500 1,220,000    
Exercised (in shares) (15,000) (28,750)    
Forfeited (in shares) (178,500) (216,250)    
Outstanding at end of the period (in shares) 2,560,000 2,165,000 2,165,000 1,190,000
Exercisable at end of the period (in shares) 636,250 131,250    
Weighted Average Exercise Price        
Outstanding at beginning of the period (in USD per share) $ 16.17 $ 15.48 $ 15.48  
Granted (in USD per share) 16.49 16.74    
Exercised (in USD per share) 15.00 15.00    
Forfeited (in USD per share) 16.57 15.70    
Outstanding at end of the period (in USD per share) 16.23 16.17 $ 16.17 $ 15.48
Exercisable at end of the period (in USD per share) $ 15.94 $ 15.00    
Aggregate intrinsic value        
Weighted average remaining life (years) 8 years 3 months 18 days 9 years 3 months 18 days 8 years 9 months 18 days 9 years 3 months 18 days
Weighted average exercisable (years) 7 years 8 months 12 days 8 years 4 months 24 days    
Aggregate intrinsic value $ 557 $ 3,438 $ 1,890 $ 862
Aggregate intrinsic value exercised 19 74    
Aggregate intrinsic value exercisable $ 273 $ 362    
Restricted stock units        
Class of Stock        
Restricted stock unit grants in period (in shares) 44,000 92,000    
Stock options and Restricted stock units        
Class of Stock        
Vesting period for stock options and restricted stock units 4 years 4 years    
Expiration period for stock options and restricted stock units 10 years 10 years