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Lease Intangibles - Schedule of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Intangible Assets, Gross Carrying Amount | $ 210,607 | $ 173,069
Amortizable Intangible Assets, Accumulated Amortization | (83,036) | (58,485)
Amortizable Intangible Assets, Net Carrying Amount | 127,571 | 114,584
Amortizable Intangible Liabilities |  |
Amortizable Intangible Liabilities, Gross Carrying Amount | (147,232) | (137,032)
Amortizable Intangible Liabilities, Accumulated Amortization | 43,391 | 32,004
Amortizable Intangible Liabilities, Net Carrying Amount | (103,841) | (105,028)
Above-market Ground Lease, Gross | (671) | 0
Above-market Ground Lease, Accumulated Amortization | 34 | 0
Above-market Ground Lease, Net | (637) | 0
Finite-Lived Intangible Liabilities, Gross | (147,903) | (137,032)
Finite-Lived Intangible Liabilities, Accumulated Amortization | 43,425 | 32,004
Finite-Lived Intangible Liabilities, Net | (104,478) | (105,028)
Below market rents, acquired | $ 10,900 |
Below market rents acquired, weighted average useful life | 12 years 1 month |
Above-market ground lease, acquired | $ 700 |
Above-market ground lease acquired, weighted average useful life | 11 years 6 months |
In-place lease intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Intangible Assets, Gross Carrying Amount | $ 193,821 | 156,420
Amortizable Intangible Assets, Accumulated Amortization | (72,749) | (47,827)
Amortizable Intangible Assets, Net Carrying Amount | 121,072 | 108,593
Intangible assets acquired | $ 41,600 |
Acquired intangible assets, weighted average useful life | 4 years 1 month |
Above-market rent |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Intangible Assets, Gross Carrying Amount | $ 16,786 | 16,649
Amortizable Intangible Assets, Accumulated Amortization | (10,287) | (10,658)
Amortizable Intangible Assets, Net Carrying Amount | 6,499 | $ 5,991
Intangible assets acquired | $ 2,700 |
Acquired intangible assets, weighted average useful life | 4 years 9 months |

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