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Acquired Intangible Assets and Liabilities (Summary of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Below-market lease, gross amount | $ 443,457 | $ 469,119
Below-market lease, accumulated amortization | (235,255) | (219,654)
Total | 208,202 | 249,465
Acquired in-place lease value |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 1,452,050 | 1,473,515
Accumulated amortization | (748,087) | (613,948)
Net | 703,963 | 859,567
Tenant relationship value |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 1,969,111 | 1,978,277
Accumulated amortization | (261,618) | (169,919)
Net | 1,707,493 | 1,808,358
Acquired above-market leases |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 280,399 | 294,514
Accumulated amortization | (145,272) | (110,139)
Net | $ 135,127 | $ 184,375

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