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Noncash Investing and Financing Activities - Summary (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Real Estate Investments, Net [Abstract] |  |  |
Accrued dividends and distributions payable | $ 17,191 | $ 41,759 |
Additions to real estate assets accrued but not yet paid | 19,757 | 2,071 |
Conversion of Operating Partnership units for common stock | 0 | 3,059 |
Lease liabilities arising from obtaining right-of-use assets | 4,024 | 0 | $ 4,074
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 |

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