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Stock-based Compensation - Restricted Share Units (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 03, 2016
Stock-based compensation            
Vested (in shares)       (20,481)    
Vested (in dollars per share)       $ 15.87    
Non-cash share compensation       $ 2,599 $ 1,944  
2013 Plan | Restricted share units            
Stock-based compensation            
Number of dividend equivalent included in award   1   1    
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    
Non-cash share compensation   $ 500 $ 300 $ 900 $ 500  
Unrecognized compensation expense   $ 4,000   $ 4,000    
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) [Member] | Officers            
Stock-based compensation            
Granted (in dollars per share) $ 28.50          
Vesting percentage 80.00%          
2013 Plan | Performance based restricted stock units (RSUs)            
Stock-based compensation            
Granted (in dollars per share) $ 26.33          
Vesting percentage 20.00%          
Performance conditions grant date fair value (in dollars per share) $ 17.67