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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