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Combined Guarantor Subsidiaries - Noncash Investing and Financing Activities - Summary (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Real Estate Investments, Net [Abstract] |  |  |
Additions to real estate assets accrued but not yet paid | $ 26,572 | $ 23,318 |
Lease liabilities arising from obtaining right-of-use assets | 4,042 |  | $ 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 |
Guarantor Subsidiaries |  |  |
Real Estate Investments, Net [Abstract] |  |  |
Additions to real estate assets accrued but not yet paid | 10,423 | 5,604 |
Distribution of properties to owners | 11,455 | 0 |
Lease liabilities arising from obtaining right-of-use assets | 489 | 0 | $ 490
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] |  |  |
Decrease in real estate assets | (60,058) | 0 |
Decrease in mortgage and other indebtedness | 115,271 | 0 |
Decrease in operating assets and liabilities | 8,246 | 0 |
Decrease in intangible lease and other assets | $ (1,663) | $ 0 |

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