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SECURED AND UNSECURED DEBT, NET - Summary (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
community
Feb. 28, 2021
Dec. 31, 2020
USD ($)
Jul. 31, 2020
USD ($)
Secured debt instruments        
Total Debt, net $ 5,452,107   $ 4,976,548  
Long-term Debt 5,447,279      
Unamortized net premium $ 29,200   12,900  
Weighted average interest rate (as a percent) 2.71%      
Weighted Average        
Secured debt instruments        
Years to maturity 7 years 6 months      
Secured Debt        
Secured debt instruments        
Total Debt, net $ 1,059,913   862,147  
Long-term Debt $ 1,034,317      
Weighted average interest rate (as a percent) 3.35%      
Number of Communities Encumbered | community 15      
Secured Debt | Weighted Average        
Secured debt instruments        
Years to maturity 7 years      
Unsecured Debt        
Secured debt instruments        
Total Debt, net $ 4,392,194   4,114,401  
Long-term Debt $ 4,412,962      
Weighted average interest rate (as a percent) 2.57%      
Deferred finance costs, net $ (26,152)   (25,937)  
Unsecured Debt | Weighted Average        
Secured debt instruments        
Years to maturity 7 years 8 months 12 days      
Fixed Rate Debt        
Secured debt instruments        
Long-term Debt $ 183,300      
Weighted average interest rate (as a percent) 3.93%      
Fixed Rate Debt | Secured Debt        
Secured debt instruments        
Total Debt, net $ 1,032,977      
Long-term Debt 1,007,317      
Fixed Rate Debt | Secured Debt | Mortgages Note Payable        
Secured debt instruments        
Total Debt, net 1,007,317   824,550  
Deferred financing costs and other non-cash adjustments (25,660)   (10,665)  
Long-term Debt $ 1,032,977   835,215  
Weighted average interest rate (as a percent) 3.42%      
Number of Communities Encumbered | community 14      
Fixed Rate Debt | Secured Debt | Mortgages Note Payable | Weighted Average        
Secured debt instruments        
Years to maturity 6 years 10 months 24 days      
Fixed Rate Debt | Unsecured Debt        
Secured debt instruments        
Unamortized discount $ 4   5  
Fixed Rate Debt | Unsecured Debt | Term Loan due September 2023        
Secured debt instruments        
Long-term Debt $ 315,000   315,000  
Weighted average interest rate (as a percent) 1.07%      
Fixed Rate Debt | Unsecured Debt | Term Loan due September 2023 | Weighted Average        
Secured debt instruments        
Years to maturity 2 years 3 months 18 days      
Fixed Rate Debt | Unsecured Debt | 8.50% Debentures, Due September 2024        
Secured debt instruments        
Long-term Debt $ 15,644   $ 15,644  
Stated interest rate 8.50%   8.50%  
Weighted average interest rate (as a percent) 8.50%      
Fixed Rate Debt | Unsecured Debt | 8.50% Debentures, Due September 2024 | Weighted Average        
Secured debt instruments        
Years to maturity 3 years 2 months 12 days      
Fixed Rate Debt | Unsecured Debt | 4.00% Medium-Term Note due October 2025        
Secured debt instruments        
Total Debt, net     $ 299,673  
Stated interest rate 4.00% 4.00% 4.00%  
Unamortized discount $ 0   $ 327  
Fixed Rate Debt | Unsecured Debt | 2.95% Medium-Term Note due September 2026        
Secured debt instruments        
Long-term Debt $ 300,000   $ 300,000  
Stated interest rate 2.95%   2.95%  
Weighted average interest rate (as a percent) 2.89%      
Fixed Rate Debt | Unsecured Debt | 2.95% Medium-Term Note due September 2026 | Weighted Average        
Secured debt instruments        
Years to maturity 5 years 2 months 12 days      
Fixed Rate Debt | Unsecured Debt | 3.50 Medium-Term Note due July 2027        
Secured debt instruments        
Total Debt, net $ 299,577   $ 299,542  
Stated interest rate 3.50%   3.50%  
Unamortized discount $ 423   $ 458  
Weighted average interest rate (as a percent) 4.03%      
Fixed Rate Debt | Unsecured Debt | 3.50 Medium-Term Note due July 2027 | Weighted Average        
Secured debt instruments        
Years to maturity 6 years      
Fixed Rate Debt | Unsecured Debt | 3.50% Medium-Term Notes Due January 2028        
Secured debt instruments        
Total Debt, net $ 299,224   $ 299,165  
Stated interest rate 3.50%   3.50%  
Unamortized discount $ 776   $ 835  
Weighted average interest rate (as a percent) 3.50%      
Fixed Rate Debt | Unsecured Debt | 3.50% Medium-Term Notes Due January 2028 | Weighted Average        
Secured debt instruments        
Years to maturity 6 years 6 months      
Fixed Rate Debt | Unsecured Debt | 4.40% Medium-Term Notes due January 2029        
Secured debt instruments        
Total Debt, net $ 299,996   $ 299,995  
Principal outstanding       $ 300,000
Stated interest rate 4.40%   4.40%  
Weighted average interest rate (as a percent) 4.27%      
Fixed Rate Debt | Unsecured Debt | 4.40% Medium-Term Notes due January 2029 | Weighted Average        
Secured debt instruments        
Years to maturity 7 years 7 months 6 days      
Fixed Rate Debt | Unsecured Debt | 3.20% Medium-Term Notes due January 2030        
Secured debt instruments        
Total Debt, net $ 611,726   $ 612,412  
Stated interest rate 3.20%   3.20%  
Unamortized discount $ 11,726   $ 12,412  
Weighted average interest rate (as a percent) 3.32%      
Fixed Rate Debt | Unsecured Debt | 3.20% Medium-Term Notes due January 2030 | Weighted Average        
Secured debt instruments        
Years to maturity 8 years 6 months      
Fixed Rate Debt | Unsecured Debt | 3.00% Medium-Term Notes due August 2031        
Secured debt instruments        
Total Debt, net $ 399,021   $ 398,973  
Stated interest rate 3.00%   3.00%  
Unamortized discount $ 979   $ 1,027  
Weighted average interest rate (as a percent) 3.01%      
Fixed Rate Debt | Unsecured Debt | 3.00% Medium-Term Notes due August 2031 | Weighted Average        
Secured debt instruments        
Years to maturity 10 years 1 month 6 days      
Fixed Rate Debt | Unsecured Debt | 2.10% Medium Term Note Due August 2032        
Secured debt instruments        
Total Debt, net $ 399,609   399,592  
Stated interest rate 2.10%      
Unamortized discount $ 391   408  
Weighted average interest rate (as a percent) 2.10%      
Fixed Rate Debt | Unsecured Debt | 2.10% Medium Term Note Due August 2032 | Weighted Average        
Secured debt instruments        
Years to maturity 11 years 1 month 6 days      
Fixed Rate Debt | Unsecured Debt | 1.90% Medium-Term Notes due March 2033        
Secured debt instruments        
Total Debt, net $ 348,589   $ 348,529  
Stated interest rate 1.90%   1.90%  
Unamortized discount $ 1,411   $ 1,471  
Weighted average interest rate (as a percent) 1.90%      
Fixed Rate Debt | Unsecured Debt | 1.90% Medium-Term Notes due March 2033 | Weighted Average        
Secured debt instruments        
Years to maturity 11 years 8 months 12 days      
Fixed Rate Debt | Unsecured Debt | 2.10% Medium-Term Note due June 2033        
Secured debt instruments        
Total Debt, net $ 298,810      
Stated interest rate 2.10% 2.10% 2.10%  
Unamortized discount $ 1,190   $ 0  
Weighted average interest rate (as a percent) 2.10%      
Fixed Rate Debt | Unsecured Debt | 2.10% Medium-Term Note due June 2033 | Weighted Average        
Secured debt instruments        
Years to maturity 12 years      
Fixed Rate Debt | Unsecured Debt | 3.10% Medium-Term Notes due November 2034        
Secured debt instruments        
Total Debt, net $ 298,823   $ 298,779  
Stated interest rate 3.10%   3.10%  
Unamortized discount $ 1,177   $ 1,221  
Weighted average interest rate (as a percent) 3.13%      
Fixed Rate Debt | Unsecured Debt | 3.10% Medium-Term Notes due November 2034 | Weighted Average        
Secured debt instruments        
Years to maturity 13 years 3 months 18 days      
Fixed Rate Debt | Unsecured Debt | Other [Member]        
Secured debt instruments        
Total Debt, net $ 9   10  
Variable Rate Debt | Secured Debt        
Secured debt instruments        
Total Debt, net 26,936      
Long-term Debt 27,000      
Variable Rate Debt | Secured Debt | Tax-exempt secured notes payable        
Secured debt instruments        
Total Debt, net 26,936   26,932  
Long-term Debt $ 27,000   27,000  
Weighted average interest rate (as a percent) 0.73%      
Number of Communities Encumbered | community 1      
Deferred finance costs, net $ (64)   (68)  
Variable Rate Debt | Secured Debt | Tax-exempt secured notes payable | Weighted Average        
Secured debt instruments        
Years to maturity 10 years 8 months 12 days      
Variable Rate Debt | Unsecured Debt | Commercial Paper        
Secured debt instruments        
Borrowings outstanding $ 470,000   190,000  
Weighted average interest rate (as a percent) 0.25%      
Borrowings outstanding at end of period $ 470,000   190,000  
Variable Rate Debt | Unsecured Debt | Commercial Paper | Weighted Average        
Secured debt instruments        
Years to maturity 1 month 6 days      
Variable Rate Debt | Unsecured Debt | Revolving credit facility due 2023 | Weighted Average        
Secured debt instruments        
Years to maturity 1 year 7 months 6 days      
Variable Rate Debt | Unsecured Debt | Working Capital Credit Facility        
Secured debt instruments        
Borrowings outstanding $ 27,318   28,024  
Weighted average interest rate (as a percent) 0.93%      
Variable Rate Debt | Unsecured Debt | Working Capital Credit Facility | Weighted Average        
Secured debt instruments        
Years to maturity 6 months      
Variable Rate Debt | Unsecured Debt | Term Loan due September 2023        
Secured debt instruments        
Long-term Debt $ 35,000   $ 35,000  
Weighted average interest rate (as a percent) 1.07%      
Variable Rate Debt | Unsecured Debt | Term Loan due September 2023 | Weighted Average        
Secured debt instruments        
Years to maturity 2 years 3 months 18 days