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Debt - 2018 Financings/Convertible Debt (Details)
$ in Millions
1 Months Ended
Apr. 30, 2018
USD ($)
community
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2011
USD ($)
Convertible Debt [Member]        
Debt Instrument [Line Items]        
Face amount   $ 316.3 $ 316.3  
Convertible Debt [Member] | Convertible Senior Notes Due June 2018 [Member]        
Debt Instrument [Line Items]        
Face amount       $ 316.3
Fixed rate       2.75%
Convertible debt   $ 313.6    
Subsequent Event [Member]        
Debt Instrument [Line Items]        
Number of communities expected to be acquired | community 5      
Subsequent Event [Member] | Mortgages [Member]        
Debt Instrument [Line Items]        
Percentage of principal bearing fixed rate 60.00%      
Fixed rate 4.55%      
Percentage of principal bearing variable rate 40.00%      
Subsequent Event [Member] | Mortgages [Member] | Non-Recourse Supplemental Loan [Member]        
Debt Instrument [Line Items]        
Face amount $ 247.6      
Subsequent Event [Member] | Mortgages [Member] | Mortgage Debt Due May 2018 [Member]        
Debt Instrument [Line Items]        
Extinguishment of debt $ 43.0      
Subsequent Event [Member] | Secured Debt [Member] | Non-Recourse First Mortgages [Member]        
Debt Instrument [Line Items]        
Number of communities securing debt | community 11      
Subsequent Event [Member] | LIBOR [Member] | Mortgages [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate basis 1.89%