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Acquired Intangible Assets and Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Amortization of below market leases $ (6,900) $ (2,000)
Expected average remaining lives of acquired below market leases (in years) 8 years 7 months 16 days  
Amortization of acquired in-place lease value and deferred leasing costs $ 108,358 44,659
Acquired in-place lease value    
Finite-Lived Intangible Assets [Line Items]    
Expected average remaining lives (in years) 6 years 5 months  
Amortization of acquired in-place lease value and deferred leasing costs $ 57,000 14,200
Weighted average remaining contractual life for acquired leases excluding renewals or extensions (in years) 6 years 1 month 15 days  
Tenant relationship value    
Finite-Lived Intangible Assets [Line Items]    
Amortization of acquired in-place lease value and deferred leasing costs $ 31,000 $ 17,600
Weighted average remaining contractual life for acquired leases excluding renewals or extensions (in years) 15 years 7 days  
Acquired above-market leases    
Finite-Lived Intangible Assets [Line Items]    
Expected average remaining lives (in years) 3 years 6 months