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Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | $ 188,767 | $ 196,417
Intangible Assets, Accumulated Amortization | (79,402) | (65,069)
Intangible Assets, net | 109,365 | 131,348
Acquired Lease Intangibles, Net | 27,958 | 31,783
Below market leases [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross | 48,200 | 49,655
Acquired Lease Intangibles, Accumulated Amortization | (20,242) | (17,872)
Acquired Lease Intangibles, Net | 27,958 | 31,783
In-place lease value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 176,557 | 181,887
Intangible Assets, Accumulated Amortization | (69,371) | (53,376)
Intangible Assets, net | 107,186 | 128,511
Tenant relationship value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 7,244 | 9,564
Intangible Assets, Accumulated Amortization | (6,558) | (8,551)
Intangible Assets, net | 686 | 1,013
Above market leases acquired [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 4,966 | 4,966
Intangible Assets, Accumulated Amortization | (3,473) | (3,142)
Intangible Assets, net | $ 1,493 | $ 1,824

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