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Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | $ 196,417 | $ 123,806
Intangible Assets, Accumulated Amortization | (65,069) | (58,834)
Intangible Assets, net | 131,348 | 64,972
Acquired Lease Intangibles, Net | 31,783 | 20,274
Below market leases [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross | 49,655 | 36,213
Acquired Lease Intangibles, Accumulated Amortization | (17,872) | (15,939)
Acquired Lease Intangibles, Net | 31,783 | 20,274
In-place lease value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 181,887 | 108,060
Intangible Assets, Accumulated Amortization | (53,376) | (47,003)
Intangible Assets, net | 128,511 | 61,057
Tenant relationship value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 9,564 | 11,201
Intangible Assets, Accumulated Amortization | (8,551) | (9,275)
Intangible Assets, net | 1,013 | 1,926
Above market leases acquired [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 4,966 | 4,545
Intangible Assets, Accumulated Amortization | (3,142) | (2,556)
Intangible Assets, net | $ 1,824 | $ 1,989

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