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Equity Incentive Plan - Additional Information (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 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, 2017
shares
Jan. 31, 2016
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
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     12,319        
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   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 | $                 $ 0.5   $ 0.5   $ 0.9    
Weighted - average period for recognition of unrecognized compensation costs                     10 months 24 days        
Compensation expense, recognized | $                 0.2 $ 0.3 $ 0.4 $ 0.6      
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 3 months 12 days        
Compensation expense, recognized | $                 0.7 $ 0.3 $ 1.1 $ 0.6      
Total unrecognized compensation cost related to LTIP Units | $                 $ 5.8   $ 5.8   $ 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%   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%   100.00%        
Long Term Incentive Plan Units | Officer | Awarded In 2016                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of awards achieving full parity (in shares)         118,791                    
Awards vested to date, percentage                 33.00%   33.00%        
Long Term Incentive Plan Units | Officer | Awarded In 2017                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of awards achieving full parity (in shares)         128,859                    
Awards vested to date, percentage                 0.00%   0.00%        
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]                              
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]                              
Percentage of target value to be paid out 150.00%