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Acquired Leases Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Document Fiscal Year Focus | 2016 |  |
Acquired lease intangible assets, net of amortization | $ 118,831 | $ 105,380 |
Finite-Lived Intangible Assets, Gross | 175,526 | 151,019 |
Finite-Lived Intangible Liabilities, Accumulated Accretion | (23,538) | (17,555) |
Accumulated amortization | (56,695) | (45,639) |
Finite-Lived Intangible Assets, Amortization Expense | 14,386 | 11,442 | $ 12,183
Acquired lease intangible liability accretion | 6,994 | 4,155 | 4,590
In-place leases, net |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 96,178 | 77,691 |
Finite-Lived Intangible Assets, Amortization Expense | 11,533 | 9,141 | 10,365
Above-market leases, net |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 14,684 | 14,841 |
Finite-Lived Intangible Assets, Amortization Expense | 1,742 | 1,950 | 1,795
Above-market ground leases, net |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 64,664 | 58,487 |
Finite-Lived Intangible Assets, Amortization Expense | 1,111 | 351 | 23
Partnership Interest [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired lease intangible assets, net of amortization | 118,831 | 105,380 |
Off-market Lease, Unfavorable | 54,180 | 42,034 |
Accumulated amortization | 56,694 | 45,639 |
Off-Market Lease, Unfavorable [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite Lived Intangible Liabilities, Gross | 71,996 | 53,868 |
Acquired lease intangible liability accretion | 6,827 | 3,940 | 4,437
Above-market leases, net |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite Lived Intangible Liabilities, Gross | 5,722 | 5,722 |
Acquired lease intangible liability accretion | $ 167 | $ 215 | $ 153

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