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Acquired Intangible Assets and Liabilities (Summary of Acquired Intangible Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Below-market lease, gross amount $ 294,682 $ 294,791
Below-market lease, accumulated amortization (198,207) (193,677)
Total 96,475 101,114
Acquired in-place lease value    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 900,132 901,381
Accumulated amortization (486,743) (472,933)
Net 413,389 428,448
Tenant relationship value    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 734,800 734,800
Accumulated amortization (30,354) (14,495)
Net 704,446 720,305
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 7,300 7,300
Accumulated amortization (873) (417)
Net 6,427 6,883
Acquired above-market leases    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 121,455 122,311
Accumulated amortization (91,348) (89,613)
Net $ 30,107 $ 32,698