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Organization, Basis of Presentation and Significant Accounting Policies (Details 3) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Lease income $ 575,070 $ 549,507 $ 1,703,263 $ 1,600,047
Total revenue 575,982 550,500 1,706,015 1,603,337
Management, development and other fees        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 912 993 2,752 3,290
Operating Segments | Established Communities        
Disaggregation of Revenue [Line Items]        
Total revenue 427,023 417,330 1,266,066 1,236,208
Operating Segments | Other Stabilized Communities        
Disaggregation of Revenue [Line Items]        
Total revenue 66,542 52,885 195,034 137,739
Non-allocated        
Disaggregation of Revenue [Line Items]        
Total revenue 912 993 2,752 3,290
Continuing Operations        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 5,870 5,844 16,954 16,961
Lease income 566,106 524,881 1,664,314 1,528,078
Gain on Business Interruption Insurance Recovery   3,495   3,495
Total revenue 571,976 534,220 1,681,268 1,548,534
Continuing Operations | Management, development and other fees        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 912 993 2,752 3,290
Continuing Operations | Rental and non-rental related income        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 4,958 4,851 14,202 13,671
Continuing Operations | Operating Segments | Established Communities        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 2,695 2,667 7,823 7,798
Lease income 424,328 414,663 1,258,243 1,228,410
Gain on Business Interruption Insurance Recovery   0   0
Total revenue 427,023 417,330 1,266,066 1,236,208
Continuing Operations | Operating Segments | Other Stabilized Communities        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 1,751 1,734 4,940 4,778
Lease income 64,791 51,151 190,094 132,961
Gain on Business Interruption Insurance Recovery   0   0
Total revenue 66,542 52,885 195,034 137,739
Continuing Operations | Operating Segments | Development/ Redevelopment Communities        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 512 450 1,439 1,095
Lease income 76,987 59,067 215,977 166,707
Gain on Business Interruption Insurance Recovery   3,495   3,495
Total revenue 77,499 63,012 217,416 171,297
Continuing Operations | Operating Segments | Management, development and other fees | Established Communities        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 0 0 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 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 0 0
Continuing Operations | Operating Segments | Rental and non-rental related income | Established Communities        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 2,695 2,667 7,823 7,798
Continuing Operations | Operating Segments | Rental and non-rental related income | Other Stabilized Communities        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 1,751 1,734 4,940 4,778
Continuing Operations | Operating Segments | Rental and non-rental related income | Development/ Redevelopment Communities        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 512 450 1,439 1,095
Continuing Operations | Non-allocated        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 912 993 2,752 3,290
Lease income 0 0 0 0
Gain on Business Interruption Insurance Recovery   0   0
Total revenue 912 993 2,752 3,290
Continuing Operations | Non-allocated | Management, development and other fees        
Disaggregation of Revenue [Line Items]        
Management, development and other fees 912 993 2,752 3,290
Continuing Operations | Non-allocated | Rental and non-rental related income        
Disaggregation of Revenue [Line Items]        
Management, development and other fees $ 0 $ 0 $ 0 $ 0