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Share Incentive and Other Compensation - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 23, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unit based compensation       $ 6,136,000 $ 5,442,000    
Trustee fees       700,000 700,000    
Total unrecognized compensation cost related to nonvested awards   $ 19,700,000   $ 19,700,000      
Weighted-average period over which cost is expected to be recognized       1 year 7 months 6 days      
Performance Period Ending December 31, 2021              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage       33.30%      
Award vesting period       3 years      
LTIP Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total fair value of shares that vested       $ 7,600,000   $ 8,500,000  
LTIP Units | Trustee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued during period, share-based compensation, net of forfeitures       42,680      
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date   17,492   17,492      
LTIP Units | Performance Period Ending December 31, 2021              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage       66.70%      
Award vesting period       3 years      
LTIP Units | Tranche One | Trustee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued during period, share-based compensation, net of forfeitures       25,188      
Restricted shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total fair value of shares that vested       $ 500,000   600,000  
Restricted shares | Trustee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued during period, share-based compensation, net of forfeitures       53,058      
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date   19,474   19,474      
Restricted shares | Tranche One | Trustee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued during period, share-based compensation, net of forfeitures       33,584      
LTIP Units and Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total value of restricted shares and LTIP units as of the grant date       $ 10,400,000   $ 11,100,000  
Weighted average grant date fair value, grants (in dollars per share)       $ 18.86   $ 32.50  
LTIP Units and Restricted Stock | Trustee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period       3 years      
Annual vesting rate of shares granted to trustees that begin vesting on the second anniversary of grant date       33.00%      
LTIP Units and Restricted Stock | General and Administrative Expense              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unit based compensation   $ 2,100,000 $ 1,800,000 $ 4,200,000 $ 3,700,000    
LTIP Units and Restricted Stock | Performance Period Ending December 31, 2021              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period       3 years      
LTIP Units and Restricted Stock | Performance Fails To Achieve, Earned Performance-Based Shares Vest At End Of Performance Period              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage       60.00%      
LTIP Units and Restricted Stock | Performance Fails To Achieve              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage       40.00%      
Award vesting period       2 years      
LTIP Units and Restricted Stock | Minimum | TSR percentile falls between the 25th percentile and the 50th percentile              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage       50.00%      
LTIP Units and Restricted Stock | Minimum | TSR percentile falls between the 50th percentile and 75th percentile              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage       100.00%      
LTIP Units and Restricted Stock | Maximum | TSR percentile falls between the 25th percentile and the 50th percentile              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage       100.00%      
LTIP Units and Restricted Stock | Maximum | TSR percentile falls between the 50th percentile and 75th percentile              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage       200.00%      
Employee Benefit Plans              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense       $ 200,000      
2020 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Increase in number of shares authorized 2,650,000            
Number of shares authorized   2,746,367   2,746,367      
Share Incentive Plan | LTIP Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued during period, share-based compensation, net of forfeitures       396,149   330,718  
Share Incentive Plan | Restricted shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued during period, share-based compensation, net of forfeitures       13,766   8,041  
Performance Shares 2019              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance period       3 years      
Volatility rate       21.00%   19.60%  
Risk-free interest rates       1.40%   2.50%  
Long Term Investment Alignment Program              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Max percentage of future fund III promote that may be awarded to senior executives             25.00%
Long Term Investment Alignment Program | Fund III              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of promote awarded as share based compensation award             25.00%
Compensation expense       $ 0   $ 0  
Long Term Investment Alignment Program | Fund IV              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of promote awarded as share based compensation award             22.80%
Awards in connection with fund to have intrinsic value   $ 0   0   0  
Compensation expense       0   0  
Long Term Investment Alignment Program | Fund V              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of promote awarded as share based compensation award             4.30%
Awards in connection with fund to have intrinsic value   $ 0   0   0  
Compensation expense       $ 0   $ 0