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Stock-based Compensation (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Stock-based compensation          
Non-cash share compensation       $ 1,944 $ 860
2013 Plan | Restricted Share Units          
Stock-based compensation          
Non-vested at the beginning of the period       55,680  
Granted (in shares) 116,206 55,680   116,206  
Non-vested at the end of the period     171,886 171,886  
Non-vested at beginning of period       $ 16.94  
Grant date value (in dollars per share) $ 20.06     19.22  
Non-vested at the end of period     $ 18.48 $ 18.48  
Vesting percentage 80.00%        
Number of dividend equivalent included in award 1        
Non-cash share compensation     $ 300 $ 500  
Unrecognized compensation expense     $ 2,300 $ 2,300  
Share based compensation fair value assumptions          
Volatility 20.70%        
Expected term in years 2 years 9 months 18 days        
Risk-free rate 1.14%        
Share price (per share) $ 15.87        
2013 Plan | Restricted Share Units | Trustees          
Stock-based compensation          
Service period 2 years        
2013 Plan | Restricted Share Units | Management          
Stock-based compensation          
Service period 3 years        
2013 Plan | Performance based RSU          
Stock-based compensation          
Vesting percentage 20.00%        
Performance conditions grant date fair value (in dollars per share) $ 15.87