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Lease Intangibles - Schedule of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Intangible Assets, Gross Carrying Amount | $ 203,512 | $ 173,069
Amortizable Intangible Assets, Accumulated Amortization | (79,919) | (58,485)
Amortizable Intangible Assets, Net Carrying Amount | 123,593 | 114,584
Amortizable Intangible Liabilities |  |
Amortizable Intangible Liabilities, Gross Carrying Amount | (144,218) | (137,032)
Amortizable Intangible Liabilities, Accumulated Amortization | 40,207 | 32,004
Amortizable Intangible Liabilities, Net Carrying Amount | (104,011) | (105,028)
Above-market Ground Lease, Gross | (671) | 0
Above-market Ground Lease, Accumulated Amortization | 19 | 0
Above-market Ground Lease, Net | (652) | 0
Finite-Lived Intangible Liabilities, Gross | (144,889) | (137,032)
Finite-Lived Intangible Liabilities, Accumulated Amortization | 40,226 | 32,004
Finite-Lived Intangible Liabilities, Net | (104,663) | (105,028)
Below market rents, acquired | $ 7,600 |
Below market rents acquired, weighted average useful life | 11 years 6 months |
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 | $ 185,273 | 156,420
Amortizable Intangible Assets, Accumulated Amortization | (67,747) | (47,827)
Amortizable Intangible Assets, Net Carrying Amount | 117,526 | 108,593
Intangible assets acquired | $ 29,600 |
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 | $ 18,239 | 16,649
Amortizable Intangible Assets, Accumulated Amortization | (12,172) | (10,658)
Amortizable Intangible Assets, Net Carrying Amount | 6,067 | $ 5,991
Intangible assets acquired | $ 1,800 |
Acquired intangible assets, weighted average useful life | 4 years 7 months |

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