Organization, Basis of Presentation and Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Management, development and other fees	$ 695	$ 1,017	$ 2,380	$ 2,950
Rental and other income	580,079	566,387	1,691,273	1,742,509
Total revenue	580,774	567,404	1,693,653	1,745,459
Operating Segments | Same Store
Disaggregation of Revenue [Line Items]
Total revenue	519,797	513,418	1,520,420	1,586,405
Operating Segments | Other Stabilized
Disaggregation of Revenue [Line Items]
Total revenue	27,908	22,316	77,034	64,962
Non-allocated
Disaggregation of Revenue [Line Items]
Total revenue	695	419	2,380	1,109
Continuing Operations
Disaggregation of Revenue [Line Items]
Management, development and other fees	3,118	3,094	9,480	8,423
Rental and other income	573,825	539,720	1,655,897	1,660,794
Gain on Business Interruption Insurance Recovery	0	282	0	378
Total revenue	576,943	543,096	1,665,377	1,669,595
Continuing Operations | Management, development and other fees and other ancillary items
Disaggregation of Revenue [Line Items]
Management, development and other fees	695	419	2,380	1,109
Continuing Operations | Rental and non-rental related income
Disaggregation of Revenue [Line Items]
Management, development and other fees	2,423	2,675	7,100	7,314
Continuing Operations | Operating Segments | Same Store
Disaggregation of Revenue [Line Items]
Management, development and other fees	1,883	1,965	5,469	5,447
Rental and other income	517,914	511,171	1,514,951	1,580,580
Gain on Business Interruption Insurance Recovery	0	282	0	378
Total revenue	519,797	513,418	1,520,420	1,586,405
Continuing Operations | Operating Segments | Other Stabilized
Disaggregation of Revenue [Line Items]
Management, development and other fees	369	598	1,148	1,637
Rental and other income	27,539	21,718	75,886	63,325
Gain on Business Interruption Insurance Recovery	0	0	0	0
Total revenue	27,908	22,316	77,034	64,962
Continuing Operations | Operating Segments | Development/ Redevelopment
Disaggregation of Revenue [Line Items]
Management, development and other fees	171	112	483	230
Rental and other income	28,372	6,831	65,060	16,889
Gain on Business Interruption Insurance Recovery	0	0	0	0
Total revenue	28,543	6,943	65,543	17,119
Continuing Operations | Operating Segments | Management, development and other fees and other ancillary items | Same Store
Disaggregation of Revenue [Line Items]
Management, development and other fees	0	0	0	0
Continuing Operations | Operating Segments | Management, development and other fees and other ancillary items | Other Stabilized
Disaggregation of Revenue [Line Items]
Management, development and other fees	0	0	0	0
Continuing Operations | Operating Segments | Management, development and other fees and other ancillary items | Development/ Redevelopment
Disaggregation of Revenue [Line Items]
Management, development and other fees	0	0	0	0
Continuing Operations | Operating Segments | Rental and non-rental related income | Same Store
Disaggregation of Revenue [Line Items]
Management, development and other fees	1,883	1,965	5,469	5,447
Continuing Operations | Operating Segments | Rental and non-rental related income | Other Stabilized
Disaggregation of Revenue [Line Items]
Management, development and other fees	369	598	1,148	1,637
Continuing Operations | Operating Segments | Rental and non-rental related income | Development/ Redevelopment
Disaggregation of Revenue [Line Items]
Management, development and other fees	171	112	483	230
Continuing Operations | Non-allocated
Disaggregation of Revenue [Line Items]
Management, development and other fees	695	419	2,380	1,109
Rental and other income	0	0	0	0
Gain on Business Interruption Insurance Recovery	0	0	0	0
Total revenue	695	419	2,380	1,109
Continuing Operations | Non-allocated | Management, development and other fees and other ancillary items
Disaggregation of Revenue [Line Items]
Management, development and other fees	695	419	2,380	1,109
Continuing Operations | Non-allocated | Rental and non-rental related income
Disaggregation of Revenue [Line Items]
Management, development and other fees	$ 0	$ 0	$ 0	$ 0