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Intangible Assets, Liabilities, and Deferred Leasing Costs - Summary of Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 27,214 $ 25,559 $ 25,633
Amortization of deferred leasing costs 2,311 2,036 1,806
In-place leases      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets 24,601 22,523 22,580
Above-market leases      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets 2,613 3,036 3,053
Below Market Leases Acquired      
Finite-Lived Intangible Assets [Line Items]      
Amortization of below-market leases $ 8,736 $ 8,570 $ 8,563