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Real Estate (Properties) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Real Estate Owned, Disclosure of Detailed Components [Abstract]      
Land $ 1,794,709   $ 1,804,504
Building and tenant improvements 7,626,515   7,626,363
Lease intangibles 652,561   667,910
Real estate, gross 10,073,785   10,098,777
Accumulated depreciation and amortization (2,386,092)   (2,349,127)
Real estate, net 7,687,693   7,749,650
Accrued capital expenditures and tenant improvements 38,900   41,700
Accumulated amortization 553,700   560,300
Intangible liabilities relating to below-market leases 385,300   392,900
Accumulated amortization on below-market leases 265,300   266,100
Below-market lease intangible amortization 4,900 $ 6,800  
Amortization of intangible assets 6,500 $ 9,300  
Leases, acquired-in-place      
Real Estate Owned, Disclosure of Detailed Components [Abstract]      
In-place lease value 587,600   601,000
In-place lease amortization expense      
2019 (remaining nine months) 17,382    
2020 17,615    
2021 12,711    
2022 9,353    
2023 6,846    
Above market leases      
Real Estate Owned, Disclosure of Detailed Components [Abstract]      
Above market leases 65,000   $ 66,900
Below-market lease accretion (income), net of above-market lease amortization      
Below-market lease accretion (income), net of above-market lease amortization      
2019 (remaining nine months) (13,278)    
2020 (14,757)    
2021 (11,982)    
2022 (9,869)    
2023 $ (8,473)