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Equity Incentive Plan - Additional Information (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 01, 2017
$ / shares
shares
Jan. 28, 2016
$ / shares
shares
Jun. 01, 2015
$ / shares
shares
Jun. 04, 2014
officer
shares
Sep. 30, 2013
officer
shares
May 17, 2013
shares
Jan. 31, 2016
shares
Jan. 31, 2015
shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
$ / shares
Dec. 31, 2014
$ / 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
Independent Trustees                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Common share issued as compensation for services performed (in shares)             23,980 26,488 6,467        
Equity Incentive Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares authorized (in shares)           3,000,000              
Vesting period for share awards under equity           3 years              
2010 Equity Incentive Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of trading days preceding the reporting date for which average of closing price of common shares is taken                 10 days        
Common shares available for issuance (in shares)                 1,871,942        
Time-based Restricted Stock Awards                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period for share awards under equity                 3 years        
Performance-based Restricted Stock Awards                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period for share awards under equity                 3 years        
Restricted Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unrecognized compensation costs | $                 $ 0.7   $ 0.9    
Weighted - average period for recognition of unrecognized compensation costs                 1 year 1 month 6 days        
Compensation expense, recognized | $                 $ 0.2 $ 0.3      
Number of shares, granted (in shares)                 5,000   0    
Long Term Incentive Plan Units                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period for share awards under equity     3 years                    
Weighted - average period for recognition of unrecognized compensation costs                 2 years 7 months 3 days        
Compensation expense, recognized | $                 $ 0.4 $ 0.3      
Total unrecognized compensation cost related to LTIP Units | $                 $ 6.4   $ 2.6    
Number of shares, granted (in shares)                 223,922   112,251    
Initial award vesting rights, percentage     50.00%                    
Annual award vesting rights after initial portion, percentage     25.00%                    
Termination period upon change in control     18 months                    
Distribution entitlement, percentage 10.00%   10.00%                    
Long Term Incentive Plan Units | Awarded June 1, 2015                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares, granted (in shares)     183,300                    
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares     $ 14.13                    
Long Term Incentive Plan Units | Officer | Awarded September 30, 2013                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of awards achieving full parity (in shares)         26,250                
Number of recipients (in officers) | officer         1                
Awards vested to date, percentage                 100.00%        
Long Term Incentive Plan Units | Officer | Awarded June 4, 2014                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of awards achieving full parity (in shares)       231,525                  
Number of recipients (in officers) | officer       2                  
Awards vested to date, percentage                 100.00%        
Long Term Incentive Plan Units, Absolute TSR Component                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Portion of awards granted, 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, percentage     37.50%                    
Total shareholder return threshold, 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, 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, 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, percentage     37.50%                    
Index percentile threshold, percentage     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, percentage     75.00%                    
Payout Percentage                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Index percentile threshold, percentage 50.00%                        
Payout Percentage | Minimum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Index percentile threshold, percentage     50.00%                    
Long Term Incentive Plan Units, Time-Based | Awarded January 28, 2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares, granted (in shares)   72,966                      
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares   $ 16.69                      
Long Term Incentive Plan Units, Time-Based | Awards March 1, 2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares, granted (in shares) 89,574                        
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares $ 18.53                        
Long Term Incentive Plan Units, Performance-Based | Awarded January 28, 2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares, granted (in shares)   39,285                      
Total shareholder return threshold, percentage   8.00%                      
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares   $ 11.09                      
Annual vesting percentage   33.33%                      
Long Term Incentive Plan Units, Performance-Based | Awards March 1, 2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares, granted (in shares) 134,348                        
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares $ 19.65                        
Long Term Incentive Plan Units, Performance-Based | Awards March 1, 2017 | Minimum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage of Target Value to be Paid Out 50.00%                        
Long Term Incentive Plan Units, Performance-Based | Awards March 1, 2017 | Maximum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage of Target Value to be Paid Out 150.00%