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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 08, 2021
Jun. 30, 2021
Dec. 31, 2020
Real Estate Investment      
Financial Instruments Not Measured at Fair Value      
Sale of derivatives $ 3,000    
Impairment charge   $ 520  
Level 2 | Market Approach Valuation Technique | Junior subordinated notes      
Financial Instruments Not Measured at Fair Value      
Market interest rate (as a percent)   4.13% 4.22%
Level 2 | Market Approach Valuation Technique | Mortgages payable | Minimum      
Financial Instruments Not Measured at Fair Value      
Market interest rate (as a percent)   3.38% 2.87%
Level 2 | Market Approach Valuation Technique | Mortgages payable | Maximum      
Financial Instruments Not Measured at Fair Value      
Market interest rate (as a percent)   3.80% 3.28%
Carrying and Fair Value | Level 2 | Junior subordinated notes      
Financial Instruments Not Measured at Fair Value      
Estimated fair value (lower) higher than carrying value   $ 8,539 $ 8,670
Carrying and Fair Value | Level 2 | Mortgages payable      
Financial Instruments Not Measured at Fair Value      
Estimated fair value (lower) higher than carrying value   $ 1,322 $ 3,831