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Summary of Significant Accounting Policies (Real Estate Assets) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
property
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
property
Jun. 30, 2018
USD ($)
property
Dec. 31, 2018
USD ($)
property
Real Estate Properties [Line Items]          
Impairment $ 13,082,000 $ 0 $ 33,155,000 $ 0  
Number of properties impaired | property     13 0  
Impaired assets held-for-sale $ 2,000,000,000   $ 2,000,000,000    
Number of real estate property held for sale | property 12   12   1
Assets held for sale $ 269,695,000   $ 269,695,000   $ 6,780,000
Mortgage notes payable $ 122,000,000   $ 122,000,000    
Buildings          
Real Estate Properties [Line Items]          
Acquired real estate asset, useful life     40 years    
Site improvements          
Real Estate Properties [Line Items]          
Acquired real estate asset, useful life     15 years