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Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | $ 117,704 | $ 160,681
Intangible Assets, Accumulated Amortization | (58,887) | (88,203)
Intangible Assets, net | 58,817 | 72,478
Acquired Lease Intangibles, Net | 17,156 | 18,119
Below market leases [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross | 32,158 | 37,579
Acquired Lease Intangibles, Accumulated Amortization | (15,002) | (19,460)
Acquired Lease Intangibles, Net | 17,156 | 18,119
In-place lease value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 100,519 | 142,889
Intangible Assets, Accumulated Amortization | (45,765) | (75,696)
Intangible Assets, net | 54,754 | 67,193
Tenant relationship value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 12,831 | 13,074
Intangible Assets, Accumulated Amortization | (10,646) | (10,167)
Intangible Assets, net | 2,185 | 2,907
Above market leases acquired [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 4,354 | 4,718
Intangible Assets, Accumulated Amortization | (2,476) | (2,340)
Intangible Assets, net | $ 1,878 | $ 2,378

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