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Equity Incentive Plan - Additional Information (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 15, 2017
shares
Jan. 28, 2016
$ / shares
shares
Jun. 01, 2015
measurement
$ / shares
shares
Jun. 04, 2014
officer
shares
Sep. 30, 2013
officer
shares
Sep. 30, 2013
officer
shares
May 17, 2013
shares
Sep. 09, 2010
shares
Apr. 21, 2010
shares
Jan. 31, 2016
shares
Jan. 31, 2015
shares
Jan. 31, 2014
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense valuation of performance-based shares (in dollars per share) | $ / shares                           $ 21.21 $ 13.17
Total unrecognized compensation cost related to LTIP Units | $                         $ 2,600 $ 2,200  
Independent Trustees                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Trustee fees | $                         $ 100 100 $ 80
Common shares issued as compensation for services performed (in shares)                   26,488 14,113 16,542      
Independent Trustees | Subsequent Event                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common shares issued as compensation for services performed (in shares) 23,980                            
Minimum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Trustee fees paid in shares (up to 100%) (at least 50%) (in percentage)                         50.00%    
Maximum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Trustee fees paid in shares (up to 100%) (at least 50%) (in percentage)                         100.00%    
Equity Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of shares authorized (in shares)             3,000,000                
Equity Incentive Plan | Minimum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period for share awards under equity             3 years                
Equity Incentive Plan | Maximum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period for share awards under equity             5 years                
Class A Performance LTIP Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Dividends, portion upon declaration (in percentage)     10.00%                        
Dividends, portion upon fully vested (in percentage)     90.00%                        
Distribution entitlement (in percentage)     10.00%                        
2010 Equity Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common shares available for issuance (in shares)                         1,900,922    
Number of trading days preceding the reporting date for which average of closing price of common shares is taken                         10 days    
Time-based Restricted Stock Awards                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period                         3 years    
Performance-based Restricted Stock Awards                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period                         3 years    
Restricted Stock                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Unrecognized compensation costs | $                         $ 900 2,100  
Weighted - average period for recognition of unrecognized compensation costs                         1 year 1 month 6 days    
Compensation expense recognized | $                         $ 1,300 $ 1,600 $ 1,300
Shares granted (in shares)                         0 85,254 87,018
Long Term Incentive Plan Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period for share awards under equity               5 years              
Weighted - average period for recognition of unrecognized compensation costs                         2 years 2 months 13 days    
Compensation expense recognized | $                         $ 1,200 $ 700 $ 800
Exchange ratio                         1    
Shares granted (in shares)               26,250 246,960       112,251 183,300 0
Shares forfeited (in shares)               15,435              
Percent of units with full parity that have vested                         100.00%    
Initial award vesting rights (in percentage)     50.00%                        
Annual award vesting rights after initial portion (in percentage)     25.00%                        
Termination period upon change in control     18 months                        
LTIP units achieving full parity (in shares)       231,525 26,250 26,250                  
Number of recipients | officer       2 1 1                  
Long Term Incentive Plan Units | Initial Vesting Period                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period     3 years                        
Long Term Incentive Plan Units | 1st Anniversary After Initial Period                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period     1 year                        
Long Term Incentive Plan Units | 2nd Anniversary After Initial Period                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period     2 years                        
Long Term Incentive Plan Units | Awarded June 1, 2015                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares)     183,300                        
Number of performance measurements | measurement     2                        
Grants in period, intrinsic value, amount (in dollars per share) | $ / shares     $ 14.13                        
Long Term Incentive Plan Units, Absolute TSR Component                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Portion of awards granted (in percentage)     60.00%                        
Long Term Incentive Plan Units, Absolute TSR Component | Minimum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Portion of awards to be granted if conditions are met (in percentage)     37.50%                        
Total shareholder return threshold (in percentage)     25.00%                        
Long Term Incentive Plan Units, Absolute TSR Component | Maximum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total shareholder return threshold (in percentage)     50.00%                        
Long Term Incentive Plan Units, Relative TSR Component                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Portion of awards granted (in percentage)     40.00%                        
Long Term Incentive Plan Units, Relative TSR Component | Minimum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Portion of awards to be granted if conditions are met (in percentage)     37.50%                        
Index percentile threshold     50.00%                        
Long Term Incentive Plan Units, Relative TSR Component | Maximum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Index percentile threshold     75.00%                        
Long Term Incentive Plan Units, Time-Based | Awarded January 28, 2016                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares)   72,966                          
Grants in period, intrinsic value, amount (in dollars per share) | $ / shares   $ 16.69                          
Long Term Incentive Plan Units, Performance-Based                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Distribution entitlement (in percentage)   10.00%                          
Long Term Incentive Plan Units, Performance-Based | Awarded January 28, 2016                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares)   39,285                          
Total shareholder return threshold (in percentage)   8.00%                          
Grants in period, intrinsic value, amount (in dollars per share) | $ / shares   $ 11.09