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Intangible Leases and Goodwill Intangible Asset and Liabilities Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired below-market lease liabilities | $ (118,012) | $ (63,287)
Accumulated amortization, intangible liabilities | 27,388 | 20,255
Goodwill | 29,085 | 0
Management Contracts |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets | 58,000 | 0
Accumulated amortization, intangible assets | (2,900) | 0
Acquired In-place Leases |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets | 313,432 | 212,916
Accumulated amortization, intangible assets | (123,314) | (92,347)
Acquired Above-market Leases |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets | 53,524 | 42,009
Accumulated amortization, intangible assets | $ (24,631) | $ (19,443)

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