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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)