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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
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 $ 4,960 $ 3,572 $ 4,147
Operating Lease, Lease Income                 2,319,666 2,280,963 2,154,481
Business interruption insurance proceeds                 1,441 26 3,498
Revenues $ 593,566 $ 587,613 $ 577,263 $ 566,184 $ 578,522 $ 575,982 $ 569,239 $ 560,792 2,324,626 2,284,535 2,158,628
Non-allocated                      
Disaggregation of Revenue [Line Items]                      
Revenues                 4,960 3,572 4,147
Established Communities | Operating segment                      
Disaggregation of Revenue [Line Items]                      
Revenues                 1,836,339 1,783,112 1,574,110
Other Stabilized Communities | Operating segment                      
Disaggregation of Revenue [Line Items]                      
Revenues                 298,415 238,584 174,933
Continuing Operations                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 13,817 9,818 10,026
Operating Lease, Lease Income                 2,287,927 2,136,246 1,974,932
Business interruption insurance proceeds                 1,441 26 3,498
Revenues                 2,303,185 2,146,090 1,988,456
Continuing Operations | Management, Development And Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 4,960 3,572 4,147
Continuing Operations | Rental and non-rental related income                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 8,857 6,246 5,879
Continuing Operations | Non-allocated                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 4,960 3,572 4,147
Operating Lease, Lease Income                 0 0 0
Business interruption insurance proceeds                 0 0 0
Revenues                 4,960 3,572 4,147
Continuing Operations | Non-allocated | Management, Development And Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 4,960 3,572 4,147
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                 6,113 4,245 3,845
Operating Lease, Lease Income                 1,829,748 1,778,841 1,570,262
Business interruption insurance proceeds                 478 26 3
Revenues                 1,836,339 1,783,112 1,574,110
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                 6,113 4,245 3,845
Continuing Operations | Other Stabilized Communities | Operating segment                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 1,941 1,732 1,294
Operating Lease, Lease Income                 295,511 236,852 173,639
Business interruption insurance proceeds                 963 0 0
Revenues                 298,415 238,584 174,933
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                 1,941 1,732 1,294
Continuing Operations | Development/Redevelopment Communities | Operating segment                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 803 269 740
Operating Lease, Lease Income                 162,668 120,553 231,031
Business interruption insurance proceeds                 0 0 3,495
Revenues                 163,471 120,822 235,266
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                 $ 803 $ 269 $ 740