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Stock-based Compensation - Restricted Share Units (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Mar. 03, 2016
Stock-based compensation        
Vested (in shares)   (20,481)    
Vested (in dollars per share)   $ 15.87    
Non-cash share compensation   $ 1,185 $ 867  
2013 Plan | Restricted share units        
Stock-based compensation        
Non-vested at the beginning of the period (in shares)   171,886    
Granted (in shares) 141,337 141,337    
Non-vested at the beginning of the period (in shares) 292,742 292,742    
Non-vested at beginning of period (in dollars per share) $ 21.37 $ 21.37    
Granted (in dollars per share)   24.08    
Non-vested at beginning of period (in dollars per share)   $ 18.48    
Vesting percentage 80.00%      
Number of dividend equivalent included in award 1 1    
Non-cash share compensation   $ 400 $ 100  
Unrecognized compensation expense $ 4,700 $ 4,700    
Share based compensation fair value assumptions        
Volatility 20.30%      
Expected term in years 2 years 9 months 18 days      
Risk-free rate 1.07%      
Share price (per share)       $ 17.67
2013 Plan | Restricted share units | Officers        
Stock-based compensation        
Share-based compensation arrangement by share-based payment award, award vesting period   3 years    
2013 Plan | Restricted share units | Directors        
Stock-based compensation        
Share-based compensation arrangement by share-based payment award, award vesting period   2 years    
2013 Plan | Market based restricted stock units (RSUs) | Officers        
Stock-based compensation        
Granted (in dollars per share) $ 28.50      
2013 Plan | Performance based restricted stock units (RSUs)        
Stock-based compensation        
Vesting percentage 20.00%      
2013 Plan | Performance based restricted stock units (RSUs) | Officers        
Stock-based compensation        
Granted (in dollars per share) $ 26.33      
Performance conditions grant date fair value (in dollars per share) $ 17.67