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Noncash Investing and Financing Activities - Summary (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Other Significant Noncash Transactions [Line Items] |  |
Accrued dividends and distributions payable |  | $ 2,420,000
Additions to real estate assets accrued but not yet paid | $ 14,130,000 | 26,572,000
Decrease in real estate assets |  | (60,059,000)
Decrease in mortgage and other indebtedness |  | 124,111,000
Decrease in operating assets and liabilities |  | 9,333,000
Decrease in intangible lease and other assets |  | (1,663,000)
Conversion of Operating Partnership common units into shares of common stock | 21,051,000 |
Increase (decrease) in lease liabilities arising from right-of-use assets | $ (159,000) | 4,042,000
Deconsolidation upon Formation or Transfer of Interests in Joint Ventures |  |
Other Significant Noncash Transactions [Line Items] |  |
Decrease in real estate assets |  | (566,000)
Increase in investment in unconsolidated affiliates |  | $ 999,000

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