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Stock-based Compensation - Restricted Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 07, 2014
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jul. 24, 2013
Shares              
Vested (in shares)         (20,481)    
Weighted Average Grant Date Fair Value              
Vested (in dollars per share)         $ 15.87    
Non-cash share compensation         $ 2,599 $ 1,944  
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         $ 2,700    
Shares              
Non-vested at the beginning of the period (in shares)         311,839    
Granted (in shares)         149,879    
Vested (in shares)         (84,736)    
Forfeited (in shares)         326    
Non-vested at the beginning of the period (in shares)     376,656   376,656    
Weighted Average Grant Date Fair Value              
Non-vested at beginning of period (in dollars per share)         $ 14.17    
Granted (in dollars per share)         17.85    
Vested (in dollars per share)         15.93    
Forfeited (in dollars per share)         15.36    
Non-vested at beginning of period (in dollars per share)     $ 15.24   $ 15.24    
Non-cash share compensation     $ 1,100 $ 800 $ 1,900 1,500  
Unrecognized compensation expense     $ 2,800   $ 2,800    
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    
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    
Non-vested at beginning of period (in dollars per share)     $ 21.37   $ 21.37    
Non-cash share compensation     $ 500 $ 300 $ 900 $ 500  
Unrecognized compensation expense     $ 4,000   $ 4,000    
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