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Fair Value of Assets and Liabilities - Non-recurring Fair Value Measurements Assets (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
property
Sep. 30, 2019
USD ($)
Fair Value of Assets and Liabilities        
Loss on impairment of real estate assets $ 2,954 $ 8,521 $ 2,954 $ 14,105
Disposal Group, Held-for-sale, Not Discontinued Operations        
Fair Value of Assets and Liabilities        
Loss on impairment of real estate assets 2,954   $ 2,954  
Number of impaired properties | property     4  
Sale of real estate properties transactions costs     $ 786  
Nonrecurring        
Fair Value of Assets and Liabilities        
Assets of properties held for sales 21,446   21,446  
Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair Value of Assets and Liabilities        
Assets of properties held for sales 0   0  
Nonrecurring | Significant Other Observable Inputs (Level 2)        
Fair Value of Assets and Liabilities        
Assets of properties held for sales 21,446   21,446  
Nonrecurring | Significant Unobservable Inputs (Level 3)        
Fair Value of Assets and Liabilities        
Assets of properties held for sales $ 0   $ 0