Intangible Assets and Intangible Liabilities - Summary of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible assets:
Gross amount	$ 479,657	$ 515,889
Accumulated amortization	(270,913)	(245,444)
Intangible assets, Net	208,744	270,445
Intangible liabilities:
Gross amount	174,670	185,191
Accumulated amortization	(100,881)	(89,200)
Intangible Liabilities, Net	73,789	95,991
Amortization of above and below-market leases, net	(10,991)	(16,059)	$ (19,523)
Leases, Acquired-in-Place, Market Adjustment [Member]
Intangible liabilities:
Amortization of above and below-market leases, net	(10,991)	(16,059)	(19,523)
Leases, Acquired-in-Place [Member]
Intangible liabilities:
Amortization of acquired in-place leases (component of "depreciation and amortization")	$ 48,932	$ 58,814	$ 76,016