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Acquired Intangible Assets and Liabilities (Summary of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Below-market lease, gross amount | $ 451,440 | $ 469,119
Below-market lease, accumulated amortization | (225,766) | (219,654)
Total | 225,674 | 249,465
Acquired in-place lease value |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 1,478,934 | 1,473,515
Accumulated amortization | (666,047) | (613,948)
Net | 812,887 | 859,567
Tenant relationship value |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 1,987,017 | 1,978,277
Accumulated amortization | (201,688) | (169,919)
Net | 1,785,329 | 1,808,358
Acquired above-market leases |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 285,963 | 294,514
Accumulated amortization | (120,395) | (110,139)
Net | $ 165,568 | $ 184,375

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