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Intangible Assets, Liabilities, and Deferred Leasing Costs - Summary of Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 25,559 $ 25,633 $ 20,879
Amortization of deferred leasing costs (a) 2,036 1,806 1,703
Accumulated amortization, acquired in-place leases      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets 22,523 22,580 18,298
Accumulated amortization, above-market leases      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets 3,036 3,053 2,581
Below Market Leases Acquired      
Finite-Lived Intangible Assets [Line Items]      
Amortization of below-market leases $ 8,570 $ 8,563 $ 6,676