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Stock-based Compensation (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stock-based compensation            
Non-cash share compensation         $ 2,929 $ 1,681
2013 Plan | Restricted Share Units            
Stock-based compensation            
Non-vested at the beginning of the period (in shares)         55,680  
Granted (in shares) 116,206 55,680     116,206  
Non-vested at the beginning of the period (in shares)     171,886   171,886  
Non-vested at beginning of period (in dollars per share)         $ 16.94  
Grant date value (in dollars per share) $ 20.06       19.22  
Non-vested at beginning of period (in dollars per share)     $ 18.48   $ 18.48  
Vesting percentage 80.00%          
Number of dividend equivalent included in award 1          
Non-cash share compensation     $ 300 $ 100 $ 800 $ 200
Unrecognized compensation expense     $ 2,000   $ 2,000  
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