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Noncash Investing and Financing Activities - Summary (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Real Estate Investments, Net [Abstract] |  |
Accrued dividends and distributions payable | $ 2,420 | $ 41,656
Additions to real estate assets accrued but not yet paid | 26,572 | 23,318
Conversion of Operating Partnership units for common stock | 0 | 3,059
Lease liabilities arising from obtaining right-of-use assets | 4,042 | 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] |  |
Decrease in real estate assets | (60,059) | 0
Decrease in mortgage and other indebtedness | 124,111 | 0
Decrease in operating assets and liabilities | 9,333 | 0
Decrease in intangible lease and other assets | (1,663) | 0
Corporate Joint Venture |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] |  |
Decrease in real estate assets | (566) | (587)
Increase in investment in unconsolidated affiliates | $ 999 | $ 974

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