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Debt - 2019 Financings (Details)
12 Months Ended
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
Aug. 29, 2019
USD ($)
community
May 07, 2019
USD ($)
community
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                      
Gain (loss) on debt modification and extinguishment, net                 $ 10,896,000 $ (5,247,000) $ (11,677,000)
Mortgage notes payable                      
Debt Instrument [Line Items]                      
Principal amount $ 156,500,000 $ 191,300,000 $ 73,100,000                
Percentage bearing fixed interest           70.00% 75.00% 60.00%      
Interest rate 3.18% 2.89% 3.55%     3.62% 3.35% 4.52%      
Percentage bearing variable interest             25.00% 40.00%      
Mortgage notes payable | Non-Recourse Supplemental Loan                      
Debt Instrument [Line Items]                      
Principal amount $ 220,500,000 $ 266,900,000 $ 149,300,000 $ 30,000,000.0 $ 29,200,000 $ 238,200,000 $ 160,300,000 $ 111,100,000      
Secured Debt | Non-Recourse First Mortgages                      
Debt Instrument [Line Items]                      
Number of communities securing debt | community 27 16 18 1 7 14 5 14      
LIBOR | Mortgage notes payable                      
Debt Instrument [Line Items]                      
Percentage bearing fixed interest           30.00%          
Basis spread on variable rate basis 2.54% 2.49% 2.10% 2.50% 2.25% 2.09% 2.17% 2.23%