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Indebtedness (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
Apr. 30, 2017
USD ($)
property
Aug. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
property
May 31, 2017
USD ($)
property
Apr. 30, 2017
USD ($)
property
Sep. 30, 2017
USD ($)
property
building
note
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
property
building
note
Sep. 30, 2016
USD ($)
Dec. 31, 2014
USD ($)
Nov. 08, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Indebtedness                            
Number of public issues of unsecured senior notes | note             6   6          
Total real estate properties, gross             $ 7,837,448,000   $ 7,837,448,000       $ 7,730,523,000  
Early repayment of senior debt, number of real estate properties collateralized by senior debt | property   17       17                
Repayments of first mortgage bond           $ 277,837,000                
Early repayment of senior debt, unamortized premium   $ 5,449,000                        
Early repayment of senior debt, debt instrument, interest rate, stated percentage   6.71%       6.71%                
Loss on early extinguishment of debt             274,000 $ 84,000 7,627,000 $ 90,000        
Line of credit facility, periodic payment, principal                 0          
Unsecured revolving credit facility             471,000,000   471,000,000       $ 327,000,000  
Unsecured revolving credit facility                            
Indebtedness                            
Unsecured revolving credit facility, maximum borrowing capacity             $ 1,000,000,000   $ 1,000,000,000          
Loss on early extinguishment of debt     $ 149,000                      
Revolving credit facility, interest rate payable (as a percent)             2.40%   2.40%          
Weighted average interest rate on debt (as a percent)             2.50% 1.80% 2.30% 1.70%        
Unsecured revolving credit facility             $ 471,000,000   $ 471,000,000          
Revolving credit facility, available amount             529,000,000   529,000,000          
Interest expense and other associated costs incurred             3,512,000 $ 2,024,000 8,538,000 $ 9,159,000        
Option to increase the borrowing capacity under revolving credit facility     $ 2,000,000,000                      
Unsecured revolving credit facility | LIBOR                            
Indebtedness                            
Interest rate added to the base rate (as a percent) 1.30%   1.20%                      
Debt instrument, facility fee (as a percent) 0.30%   0.25%                      
Unsecured revolving credit facility | Subsequent Event                            
Indebtedness                            
Unsecured revolving credit facility                       $ 485,000,000    
Revolving credit facility, available amount                       $ 515,000,000    
Senior unsecured notes due 2019                            
Indebtedness                            
Unsecured term loan facility             $ 400,000,000   $ 400,000,000          
Interest rate (as a percent)             3.25%   3.25%          
Senior unsecured notes 6.75%                            
Indebtedness                            
Unsecured term loan facility             $ 200,000,000   $ 200,000,000          
Interest rate (as a percent)             6.75%   6.75%          
Senior unsecured notes due 2021                            
Indebtedness                            
Unsecured term loan facility             $ 300,000,000   $ 300,000,000          
Interest rate (as a percent)             6.75%   6.75%          
Senior unsecured notes 4.75%                            
Indebtedness                            
Unsecured term loan facility             $ 250,000,000   $ 250,000,000          
Senior unsecured notes due 2024                            
Indebtedness                            
Interest rate (as a percent)             4.75%   4.75%          
Senior unsecured notes 5.625% due in 2042                            
Indebtedness                            
Unsecured term loan facility             $ 350,000,000   $ 350,000,000          
Interest rate (as a percent)             5.625%   5.625%          
Senior unsecured notes 6.25% due in 2046                            
Indebtedness                            
Unsecured term loan facility             $ 250,000,000   $ 250,000,000          
Interest rate (as a percent)             6.25%   6.25%          
Term loan due 2020                            
Indebtedness                            
Unsecured term loan facility                     $ 350,000,000      
Interest rate (as a percent)             2.64%   2.64%          
Weighted average interest rate on debt (as a percent)             2.60% 1.90% 2.40% 1.90%        
Interest expense and other associated costs incurred             $ 2,363,000 $ 1,707,000 $ 6,419,000 $ 4,956,000        
Maximum borrowing capacity that may be increased             700,000,000   700,000,000          
Term loan due 2020 | LIBOR                            
Indebtedness                            
Interest rate added to the base rate (as a percent)                     1.40%      
Term loan due 2022                            
Indebtedness                            
Unsecured term loan facility             $ 200,000,000   $ 200,000,000          
Interest rate (as a percent)             2.60%   2.60%          
Weighted average interest rate on debt (as a percent)             2.70% 2.30% 2.70% 2.30%        
Term loan due 2022 | LIBOR                            
Indebtedness                            
Interest rate added to the base rate (as a percent) 1.80%   1.35%                      
Term loan due 2022 | Senior Living Communities                            
Indebtedness                            
Unsecured term loan facility                           $ 200,000,000
Mortgages                            
Indebtedness                            
Aggregate principal amount of mortgage debt             $ 806,418,000   $ 806,418,000          
Number of properties mortgaged | property             24   24          
Number of buildings mortgaged | building             25   25          
Total real estate properties, gross             $ 1,232,275,000   $ 1,232,275,000          
Capital leases                            
Indebtedness                            
Total real estate properties, gross             $ 36,234,000   $ 36,234,000          
Number of properties recorded under capital lease | property             2   2          
Capital leases             $ 10,892,000   $ 10,892,000          
Secured debt due August 2017                            
Indebtedness                            
Early repayment of senior debt, number of real estate properties collateralized by senior debt | property         1                  
Repayments of first mortgage bond         $ 10,579,000                  
Early repayment of senior debt, debt instrument, interest rate, stated percentage         6.15%                  
Secured debt due August 2037                            
Indebtedness                            
Early repayment of senior debt, number of real estate properties collateralized by senior debt | property       1                    
Repayments of first mortgage bond       $ 8,807,000                    
Early repayment of senior debt, debt instrument, interest rate, stated percentage       5.95%                    
Loss on early extinguishment of debt                 7,353,000          
Unsecured debt due September 2015                            
Indebtedness                            
Interest expense and other associated costs incurred             1,404,000 $ 1,173,000 4,129,000 $ 3,433,000        
Unsecured debt                            
Indebtedness                            
Loss on early extinguishment of debt     $ 125,000                      
Maximum borrowing capacity that may be increased             $ 400,000,000   $ 400,000,000