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Debt - 2019 Financings (Details)
3 Months Ended 12 Months Ended
Aug. 29, 2019
USD ($)
community
May 07, 2019
USD ($)
community
Apr. 30, 2018
USD ($)
community
Dec. 31, 2018
USD ($)
community
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
community
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]              
Debt modification and extinguishment costs         $ (5,247,000) $ (11,677,000) $ (12,409,000)
Non-Recourse First Mortgages              
Debt Instrument [Line Items]              
Extinguishment of debt       $ 307,400,000      
Mortgage notes payable              
Debt Instrument [Line Items]              
Percentage bearing fixed interest 75.00% 60.00% 60.00% 65.00%   65.00%  
Interest rate 3.35% 4.52% 4.55% 5.08%   5.08%  
Percentage bearing variable interest 25.00% 40.00% 40.00% 35.00%   35.00%  
Mortgage notes payable | Non-Recourse Supplemental Loan              
Debt Instrument [Line Items]              
Principal amount $ 160,300,000 $ 111,100,000 $ 247,600,000 $ 327,000,000.0   $ 327,000,000.0  
Mortgage notes payable | Mortgage Debt Due 2019              
Debt Instrument [Line Items]              
Extinguishment of debt $ 139,200,000 $ 155,500,000          
Secured Debt | Non-Recourse First Mortgages              
Debt Instrument [Line Items]              
Number of communities securing debt | community 5 14 11 28   28  
LIBOR | Mortgage notes payable              
Debt Instrument [Line Items]              
Basis spread on variable rate basis 2.17% 2.23% 1.89% 2.16%