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Organization, Basis of Presentation, and Significant Accounting Policies Organization, Basis of Presentation, and Significant Accounting Policies (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | $ 3,819 | $ 4,960 | $ 3,572
Operating Lease, Lease Income | 2,297,442 | 2,319,666 | 2,280,963
Total revenue | 2,301,261 | 2,324,626 | 2,284,535
Non-allocated |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 3,819 | 4,960 | 3,572
Established Communities | Operating segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,028,317 | 2,107,288 | 1,731,570
Other Stabilized Communities | Operating segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 140,173 | 110,434 | 238,584
Continuing Operations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 13,643 | 13,612 | 9,818
Operating Lease, Lease Income | 2,242,282 | 2,236,405 | 2,084,704
Business interruption insurance proceeds | 385 | 1,441 | 26
Total revenue | 2,256,310 | 2,251,458 | 2,094,548
Continuing Operations | Management, Development And Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 3,819 | 4,960 | 3,572
Continuing Operations | Rental and non-rental related income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 9,824 | 8,652 | 6,246
Continuing Operations | Non-allocated |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 3,819 | 4,960 | 3,572
Operating Lease, Lease Income | 0 | 0 | 0
Business interruption insurance proceeds | 0 | 0 | 0
Total revenue | 3,819 | 4,960 | 3,572
Continuing Operations | Non-allocated | Management, Development And Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 3,819 | 4,960 | 3,572
Continuing Operations | Non-allocated | Rental and non-rental related income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 0 | 0 | 0
Continuing Operations | Established Communities | Operating segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 6,970 | 7,028 | 4,245
Operating Lease, Lease Income | 2,021,232 | 2,099,273 | 1,727,299
Business interruption insurance proceeds | 115 | 987 | 26
Total revenue | 2,028,317 | 2,107,288 | 1,731,570
Continuing Operations | Established Communities | Operating segment | Management, Development And Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 0 | 0 | 0
Continuing Operations | Established Communities | Operating segment | Rental and non-rental related income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 6,970 | 7,028 | 4,245
Continuing Operations | Other Stabilized Communities | Operating segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 1,790 | 1,224 | 1,732
Operating Lease, Lease Income | 138,113 | 108,756 | 236,852
Business interruption insurance proceeds | 270 | 454 | 0
Total revenue | 140,173 | 110,434 | 238,584
Continuing Operations | Other Stabilized Communities | Operating segment | Management, Development And Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 0 | 0 | 0
Continuing Operations | Other Stabilized Communities | Operating segment | Rental and non-rental related income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 1,790 | 1,224 | 1,732
Continuing Operations | Development/Redevelopment Communities | Operating segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 1,064 | 400 | 269
Operating Lease, Lease Income | 82,937 | 28,376 | 120,553
Business interruption insurance proceeds | 0 | 0 | 0
Total revenue | 84,001 | 28,776 | 120,822
Continuing Operations | Development/Redevelopment Communities | Operating segment | Management, Development And Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | 0 | 0 | 0
Continuing Operations | Development/Redevelopment Communities | Operating segment | Rental and non-rental related income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Management, development and other fees | $ 1,064 | $ 400 | $ 269

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