Acquired Leases Intangibles (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		$ 502,132	$ 606,758
Accumulated amortization		(259,310)	(219,689)
Acquired lease intangible assets, net of amortization		242,822	387,069
Finite Lived Intangible Liabilities		558,936	589,472
Finite-Lived Intangible Liabilities, Accumulated Accretion		(131,676)	(92,746)
Off-market Lease, Unfavorable		427,260	496,726
Finite-Lived Intangible Assets, Amortization Expense		69,362	88,770	$ 99,613
Acquired lease intangible liability accretion		54,730	45,655	34,922
Partnership Interest [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization		(259,310)	(219,689)
Acquired lease intangible assets, net of amortization		242,822	387,069
Off-market Lease, Unfavorable		427,260	496,726
In-place leases, net [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		438,188	457,379
Finite-Lived Intangible Assets, Amortization Expense		60,250	76,649	88,284
Above Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		63,944	57,294
Finite-Lived Intangible Assets, Amortization Expense		9,112	10,433	9,443
Off-Market Favorable Lease [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	[1]		92,085
Finite-Lived Intangible Assets, Amortization Expense	[1]		1,688	1,886
Off-Market Lease, Unfavorable [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Liabilities, Gross		558,936	584,371
Acquired lease intangible liability accretion		$ 54,730	45,561	34,786
Above Market Ground Rent Lease [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Liabilities, Gross	[1]		5,101
Above Market Ground Lease Amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible liability accretion	[1]		$ 94	$ 136

[1] On January 1, 2019, the Company adopted the new accounting guidance in ASC Topic 842, Leases, including all related ASUs, and correspondingly reclassified Below-market ground leases and Above-market ground leases against the Company’s Right of use asset.