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Summary of Significant Accounting Policies - Amortization of Deferred Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Amortization of Deferred Charges $ 24,119 $ 18,545 $ 11,785
Lease Intangibles (In-place)      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Amortization of Deferred Charges 10,619 7,877 6,353
Lease Intangibles (Above-Market)      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Amortization of Deferred Charges 18,107 14,871 9,707
Lease Intangibles (Below-Market)      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Amortization of Below Market Lease $ (4,607) $ (4,203) $ (4,275)