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Intangible Assets and Intangible Liabilities - Summary of Intangible Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Intangible assets:          
Gross amount $ 518,207   $ 518,207   $ 553,063
Accumulated amortization (230,985)   (230,985)   (200,857)
Intangible assets, Net 287,222   287,222   352,206
Intangible liabilities:          
Gross amount 186,550   186,550   205,101
Accumulated amortization (84,271)   (84,271)   (75,073)
Intangible Liabilities, Net 102,279   102,279   $ 130,028
Leases, Acquired-in-Place, Market Adjustment [Member]          
Intangible liabilities:          
Amortization of above and below-market leases, net (component of “rental income”) 3,887 $ 3,175 12,611 $ 14,164  
Leases, Acquired-in-Place [Member]          
Intangible liabilities:          
Amortization of acquired in-place leases (component of “depreciation and amortization”) $ 14,865 $ 17,929 $ 44,879 $ 58,352