Summary of Significant Accounting Policies (Assets Held for Sale) (Details) $ in Thousands	Dec. 31, 2019 USD ($) Property	Dec. 31, 2018 USD ($)
Long Lived Assets Held-for-sale [Line Items]
Number of properties held for sale | Property	1
Total assets held for sale	$ 49,988	$ 0
Total liabilities associated with assets held for sale	34,713	$ 0
Held for sale
Long Lived Assets Held-for-sale [Line Items]
Investment property, net	49,823
Tenant and other receivables, net	74
Other assets	91
Total assets held for sale	49,988
Accounts payable and accrued expenses	192
Other liabilities	225
Notes payable, net	34,296
Total liabilities associated with assets held for sale	$ 34,713