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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 $ 3,572 $ 4,147 $ 5,599
Business interruption insurance proceeds                 26 3,498 20,564
Revenues $ 578,522 $ 575,982 $ 569,239 $ 560,792 $ 555,292 $ 550,500 $ 530,512 $ 522,326 2,284,535 2,158,628 2,045,255
Non-allocated                      
Disaggregation of Revenue [Line Items]                      
Revenues                 3,572 4,147 5,599
Established Communities | Operating segment                      
Disaggregation of Revenue [Line Items]                      
Revenues                 1,632,426 1,591,665 1,432,109
Other Stabilized Communities | Operating segment                      
Disaggregation of Revenue [Line Items]                      
Revenues                 262,053 193,594 221,272
Continuing Operations                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 17,465 17,161 17,464
Lease income                 2,178,179 2,004,013 1,828,036
Business interruption insurance proceeds                 26 3,498 20,529
Revenues                 2,195,670 2,024,672 1,866,029
Continuing Operations | Management, development and other fees                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 3,572 4,147 5,599
Continuing Operations | Rental and non-rental related income                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 13,893 13,014 11,865
Continuing Operations | Non-allocated                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 3,572 4,147 5,599
Lease income                 0 0 0
Business interruption insurance proceeds                 0 0 0
Revenues                 3,572 4,147 5,599
Continuing Operations | Non-allocated | Management, development and other fees                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 3,572 4,147 5,599
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                 9,563 9,453 8,299
Lease income                 1,622,837 1,582,209 1,423,658
Business interruption insurance proceeds                 26 3 152
Revenues                 1,632,426 1,591,665 1,432,109
Continuing Operations | Established Communities | Operating segment | Management, development and other fees                      
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                 9,563 9,453 8,299
Continuing Operations | Other Stabilized Communities | Operating segment                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 2,417 2,083 2,172
Lease income                 259,636 191,511 219,035
Business interruption insurance proceeds                 0 0 65
Revenues                 262,053 193,594 221,272
Continuing Operations | Other Stabilized Communities | Operating segment | Management, development and other fees                      
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                 2,417 2,083 2,172
Continuing Operations | Development/Redevelopment Communities | Operating segment                      
Disaggregation of Revenue [Line Items]                      
Management, development and other fees                 1,913 1,478 1,394
Lease income                 295,706 230,293 185,343
Business interruption insurance proceeds                 0 3,495 20,312
Revenues                 297,619 235,266 207,049
Continuing Operations | Development/Redevelopment Communities | Operating segment | Management, development and other fees                      
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                 $ 1,913 $ 1,478 $ 1,394