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Intangibles - Schedule of Intangibles Lease Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Intangible assets and liabilities |  |
Gross intangible lease assets | $ 795,305 | $ 911,697
Accumulated depreciation and amortization | (385,223) | (431,892)
Net intangible lease assets | 410,082 | 479,805
Lease-up intangibles |  |
Intangible assets and liabilities |  |
Gross intangible lease assets | 645,143 | 719,788
Tenant leases | Above market |  |
Intangible assets and liabilities |  |
Gross intangible lease assets | 105,663 | 147,409
Ground leases | Below market |  |
Intangible assets and liabilities |  |
Gross intangible lease assets | $ 44,499 | $ 44,500

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