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Debt - Credit Facilities (Details)
Sep. 30, 2020
USD ($)
Sep. 09, 2020
USD ($)
community
Aug. 31, 2020
USD ($)
community
Mar. 31, 2020
USD ($)
community
Mar. 20, 2020
USD ($)
community
Mar. 19, 2020
USD ($)
community
Jan. 31, 2020
USD ($)
community
Dec. 05, 2018
USD ($)
Collateral Deposits                
Credit Facilities [Line Items]                
Restricted cash $ 41,400,000              
Letter of Credit                
Credit Facilities [Line Items]                
Restricted cash 41,000,000.0              
Mortgages                
Credit Facilities [Line Items]                
Debt face amount   $ 156,500,000 $ 191,300,000 $ 73,100,000        
Fifth Amended and Restated Credit Agreement | Line of Credit                
Credit Facilities [Line Items]                
Line of credit, borrowings outstanding     $ 166,400,000          
Letters of credit issued 87,700,000              
Revolving Credit Facility | Fifth Amended and Restated Credit Agreement | Line of Credit                
Credit Facilities [Line Items]                
Credit facility, maximum borrowing capacity               $ 250,000,000
Letter of Credit Sublimit | Fifth Amended and Restated Credit Agreement | Line of Credit                
Credit Facilities [Line Items]                
Credit facility, maximum borrowing capacity               60,000,000.0
Swingline Line of Credit | Fifth Amended and Restated Credit Agreement | Line of Credit                
Credit Facilities [Line Items]                
Credit facility, maximum borrowing capacity               $ 50,000,000.0
Letter of Credit | Fifth Amended and Restated Credit Agreement | Line of Credit                
Credit Facilities [Line Items]                
Credit facility, maximum borrowing capacity 50,000,000.0              
Letters of credit issued $ 46,700,000              
Non-Recourse First Mortgages | Secured debt                
Credit Facilities [Line Items]                
Number of communities securing debt | community   27 16 18 1 7 14  
Non-Recourse Supplemental Loan | Mortgages                
Credit Facilities [Line Items]                
Debt face amount   $ 220,500,000 $ 266,900,000 $ 149,300,000 $ 30,000,000.0 $ 29,200,000 $ 238,200,000