Summary of Significant Accounting Policies - Amortization of Deferred Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of deferred charges	$ 10,671	$ 7,317
Lease intangibles (in-place)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of deferred charges	5,915	3,508
Lease intangibles (above-market)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of deferred charges	6,401	5,051
Lease intangibles (below-market)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of below market lease	$ (1,645)	$ (1,242)