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Organization, Basis of Presentation and Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Management, development and other fees	$ 877	$ 1,007
Rental and other income	550,258	601,260
Total revenue	551,135	602,267
Operating Segments | Established Communities
Disaggregation of Revenue [Line Items]
Total revenue	502,258	552,633
Operating Segments | Other Stabilized Communities
Disaggregation of Revenue [Line Items]
Total revenue	29,993	28,585
Non-allocated
Disaggregation of Revenue [Line Items]
Total revenue	877	1,007
Continuing Operations
Disaggregation of Revenue [Line Items]
Management, development and other fees	3,107	3,285
Rental and other income	545,725	583,729
Gain on Business Interruption Insurance Recovery	0	0
Total revenue	548,832	587,014
Continuing Operations | Management, development and other fees
Disaggregation of Revenue [Line Items]
Management, development and other fees	877	1,007
Continuing Operations | Rental and non-rental related income
Disaggregation of Revenue [Line Items]
Management, development and other fees	2,230	2,278
Continuing Operations | Operating Segments | Established Communities
Disaggregation of Revenue [Line Items]
Management, development and other fees	1,668	1,633
Rental and other income	500,590	551,000
Gain on Business Interruption Insurance Recovery	0	0
Total revenue	502,258	552,633
Continuing Operations | Operating Segments | Other Stabilized Communities
Disaggregation of Revenue [Line Items]
Management, development and other fees	427	594
Rental and other income	29,566	27,991
Gain on Business Interruption Insurance Recovery	0	0
Total revenue	29,993	28,585
Continuing Operations | Operating Segments | Development/ Redevelopment Communities
Disaggregation of Revenue [Line Items]
Management, development and other fees	135	51
Rental and other income	15,569	4,738
Gain on Business Interruption Insurance Recovery	0	0
Total revenue	15,704	4,789
Continuing Operations | Operating Segments | Management, development and other fees | Established Communities
Disaggregation of Revenue [Line Items]
Management, development and other fees	0	0
Continuing Operations | Operating Segments | Management, development and other fees | Other Stabilized Communities
Disaggregation of Revenue [Line Items]
Management, development and other fees	0	0
Continuing Operations | Operating Segments | Management, development and other fees | Development/ Redevelopment Communities
Disaggregation of Revenue [Line Items]
Management, development and other fees	0	0
Continuing Operations | Operating Segments | Rental and non-rental related income | Established Communities
Disaggregation of Revenue [Line Items]
Management, development and other fees	1,668	1,633
Continuing Operations | Operating Segments | Rental and non-rental related income | Other Stabilized Communities
Disaggregation of Revenue [Line Items]
Management, development and other fees	427	594
Continuing Operations | Operating Segments | Rental and non-rental related income | Development/ Redevelopment Communities
Disaggregation of Revenue [Line Items]
Management, development and other fees	135	51
Continuing Operations | Non-allocated
Disaggregation of Revenue [Line Items]
Management, development and other fees	877	1,007
Rental and other income	0	0
Gain on Business Interruption Insurance Recovery	0	0
Total revenue	877	1,007
Continuing Operations | Non-allocated | Management, development and other fees
Disaggregation of Revenue [Line Items]
Management, development and other fees	877	1,007
Continuing Operations | Non-allocated | Rental and non-rental related income
Disaggregation of Revenue [Line Items]
Management, development and other fees	$ 0	$ 0

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