Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Net property	$ 3,101,931		$ 3,371,231
Other assets	117,959		115,678
Other liabilities	32,104		15,985
Debt, net	2,201,755
Equity	1,570,849	$ 1,603,814	1,688,303	$ 1,729,665	$ 1,760,463	$ 1,811,028
MAP Venture
Schedule of Equity Method Investments [Line Items]
Net property	186,865		192,582
Other assets	251,765		256,453
Other liabilities	266,383		266,200
Debt, net	182,279		181,525
Equity	(10,032)		1,310
Other
Schedule of Equity Method Investments [Line Items]
Net property	651,223		641,785
Other assets	85,123		85,549
Other liabilities	15,706		23,871
Debt, net	426,988		403,543
Equity	293,652		299,920
Total
Schedule of Equity Method Investments [Line Items]
Net property	838,088		834,367
Other assets	336,888		342,002
Other liabilities	282,089		290,071
Debt, net	609,267		585,068
Equity	$ 283,620		$ 301,230