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Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | $ 194,509 | $ 196,417
Intangible Assets, Accumulated Amortization | (74,606) | (65,069)
Intangible Assets, net | 119,903 | 131,348
Acquired Lease Intangibles, Net | 29,813 | 31,783
Below market leases [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross | 49,228 | 49,655
Acquired Lease Intangibles, Accumulated Amortization | (19,415) | (17,872)
Acquired Lease Intangibles, Net | 29,813 | 31,783
In-place lease value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 179,979 | 181,887
Intangible Assets, Accumulated Amortization | (62,584) | (53,376)
Intangible Assets, net | 117,395 | 128,511
Tenant relationship value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 9,564 | 9,564
Intangible Assets, Accumulated Amortization | (8,715) | (8,551)
Intangible Assets, net | 849 | 1,013
Above market leases acquired [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 4,966 | 4,966
Intangible Assets, Accumulated Amortization | (3,307) | (3,142)
Intangible Assets, net | $ 1,659 | $ 1,824

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