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Stock-based Compensation (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 07, 2014
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jul. 24, 2013
Weighted Average Grant Date Fair Value              
Non-cash share compensation         $ 3,497 $ 2,929  
2013 Plan | Restricted common shares              
Stock-based compensation              
Maximum number of shares authorized 2,450,000           600,000
Increase in number of common shares authorized for issuance 1,850,000            
Grant date value         $ 2,800    
Shares              
Non-vested at the beginning of the period (in shares)         311,839    
Granted (in shares)         155,306    
Vested (in shares)         (157,878)    
Forfeited (in shares)         326    
Non-vested at the beginning of the period (in shares)     308,941   308,941    
Weighted Average Grant Date Fair Value              
Non-vested at beginning of period (in dollars per share)         $ 14.17    
Granted (in dollars per share)         17.96    
Vested (in dollars per share)         14.09    
Forfeited (in dollars per share)         15.36    
Non-vested at beginning of period (in dollars per share)     $ 16.11   $ 16.11    
Non-cash share compensation     $ 900 $ 700 $ 2,800 2,200  
Unrecognized compensation expense     $ 2,100   $ 2,100    
Initial estimated cumulative forfeiture rate (as a percent)         0.00%    
2013 Plan | Restricted common shares | Officers              
Stock-based compensation              
Vesting period         1 year    
2013 Plan | Restricted common shares | Trust employees              
Stock-based compensation              
Vesting period         3 years    
2013 Plan | Restricted Share Units (RSUs)              
Shares              
Non-vested at the beginning of the period (in shares)         171,886    
Granted (in shares)   141,337     141,337    
Vested (in shares)         (20,481)    
Non-vested at the beginning of the period (in shares)     292,742   292,742    
Weighted Average Grant Date Fair Value              
Non-vested at beginning of period (in dollars per share)         $ 18.48    
Granted (in dollars per share)         24.08    
Vested (in dollars per share)         15.87    
Non-vested at beginning of period (in dollars per share)     $ 21.37   $ 21.37    
Non-cash share compensation     $ 600 $ 300 $ 1,500 $ 800  
Unrecognized compensation expense     $ 3,400   $ 3,400    
2013 Plan | Restricted Share Units (RSUs) | Officers              
Stock-based compensation              
Vesting period         3 years    
2013 Plan | Restricted Share Units (RSUs) | Directors              
Stock-based compensation              
Vesting period         2 years