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Lease Intangibles - Schedule of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Intangible Assets, Gross Carrying Amount | $ 217,106 | $ 210,607
Amortizable Intangible Assets, Accumulated Amortization | (92,056) | (83,036)
Amortizable Intangible Assets, Net Carrying Amount | 125,050 | 127,571
Amortizable Intangible Liabilities |  |
Amortizable Intangible Liabilities, Gross Carrying Amount | (150,211) | (147,232)
Amortizable Intangible Liabilities, Accumulated Amortization | 46,560 | 43,391
Amortizable Intangible Liabilities, Net Carrying Amount | (103,651) | (103,841)
Above-market Ground Lease, Gross | (671) | (671)
Above-market Ground Lease, Accumulated Amortization | 49 | 34
Above-market Ground Lease, Net | (622) | (637)
Finite-Lived Intangible Liabilities, Gross | (150,882) | (147,903)
Finite-Lived Intangible Liabilities, Accumulated Amortization | 46,609 | 43,425
Finite-Lived Intangible Liabilities, Net | (104,273) | (104,478)
Below market rents, acquired | $ 3,000 | $ 10,900
Below market rents acquired, weighted average useful life | 25 years 8 months | 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 | $ 199,740 | $ 193,821
Amortizable Intangible Assets, Accumulated Amortization | (81,262) | (72,749)
Amortizable Intangible Assets, Net Carrying Amount | 118,478 | 121,072
Intangible assets acquired | $ 5,900 | $ 41,600
Acquired intangible assets, weighted average useful life | 4 years 7 months | 4 years 1 month
Above-market rent |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Intangible Assets, Gross Carrying Amount | $ 17,366 | $ 16,786
Amortizable Intangible Assets, Accumulated Amortization | (10,794) | (10,287)
Amortizable Intangible Assets, Net Carrying Amount | 6,572 | 6,499
Intangible assets acquired | $ 600 | $ 2,700
Acquired intangible assets, weighted average useful life | 1 year 1 month | 4 years 9 months

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