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Indebtedness (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 03, 2017
USD ($)
Apr. 30, 2017
USD ($)
property
Jun. 30, 2017
USD ($)
property
building
note
May 31, 2017
USD ($)
property
Apr. 30, 2017
USD ($)
property
Jun. 30, 2017
USD ($)
property
building
note
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
property
building
note
Jun. 30, 2016
USD ($)
Dec. 31, 2014
USD ($)
Aug. 02, 2017
USD ($)
Jul. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Indebtedness                            
Number of public issues of unsecured senior notes | note     6     6   6            
Principal amount of unsecured senior notes     $ 1,724,210,000     $ 1,724,210,000   $ 1,724,210,000         $ 1,722,758,000  
Total real estate properties, gross     7,799,820,000     7,799,820,000   7,799,820,000         7,730,523,000  
Early repayment of senior debt, unamortized premium   $ 5,449,000                        
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, debt instrument, interest rate, stated percentage   6.71%     6.71%                  
Loss on early extinguishment of debt           7,353,000 $ 0 7,353,000 $ 6,000          
Line of credit facility, periodic payment, principal               0            
Unsecured revolving credit facility     434,000,000     434,000,000   434,000,000         $ 327,000,000  
Unsecured revolving credit facility                            
Indebtedness                            
Unsecured revolving credit facility, maximum borrowing capacity     $ 1,000,000,000     $ 1,000,000,000   $ 1,000,000,000            
Revolving credit facility, interest rate payable (as a percent)     2.50%     2.50%   2.50%            
Weighted average interest rate on debt (as a percent)           2.30% 1.70% 2.20% 1.70%          
Unsecured revolving credit facility     $ 434,000,000     $ 434,000,000   $ 434,000,000            
Revolving credit facility, available amount     566,000,000     566,000,000   566,000,000            
Interest expense and other associated costs incurred           2,662,000 $ 3,454,000 $ 5,026,000 $ 7,136,000          
Unsecured revolving credit facility | LIBOR                            
Indebtedness                            
Interest rate added to the base rate (as a percent)               1.30%            
Debt instrument, facility fee (as a percent)               0.30%            
Unsecured revolving credit facility | Subsequent Event                            
Indebtedness                            
Unsecured revolving credit facility                     $ 415,000,000      
Revolving credit facility, available amount                     $ 585,000,000      
Option to increase the borrowing capacity under revolving credit facility $ 2,000,000,000,000,000                          
Unsecured revolving credit facility | Subsequent Event | LIBOR                            
Indebtedness                            
Interest rate added to the base rate (as a percent) 1.20%                          
Debt instrument, facility fee (as a percent) 0.25%                          
Senior unsecured notes due 2019                            
Indebtedness                            
Principal amount of unsecured senior notes     $ 400,000,000     $ 400,000,000   $ 400,000,000            
Interest rate (as a percent)     3.25%     3.25%   3.25%            
Senior unsecured notes 6.75%                            
Indebtedness                            
Principal amount of unsecured senior notes     $ 200,000,000     $ 200,000,000   $ 200,000,000            
Interest rate (as a percent)     6.75%     6.75%   6.75%            
Senior unsecured notes due 2021                            
Indebtedness                            
Principal amount of unsecured senior notes     $ 300,000,000     $ 300,000,000   $ 300,000,000            
Interest rate (as a percent)     6.75%     6.75%   6.75%            
Senior unsecured notes 4.75%                            
Indebtedness                            
Principal amount of unsecured senior notes     $ 250,000,000     $ 250,000,000   $ 250,000,000            
Senior unsecured notes due 2024                            
Indebtedness                            
Interest rate (as a percent)     4.75%     4.75%   4.75%            
Senior unsecured notes 5.625% due in 2042                            
Indebtedness                            
Principal amount of unsecured senior notes     $ 350,000,000     $ 350,000,000   $ 350,000,000            
Interest rate (as a percent)     5.625%     5.625%   5.625%            
Senior unsecured notes 6.25% due in 2046                            
Indebtedness                            
Principal amount of unsecured senior notes     $ 250,000,000     $ 250,000,000   $ 250,000,000            
Interest rate (as a percent)     6.25%     6.25%   6.25%            
Term loan due 2020                            
Indebtedness                            
Interest rate (as a percent)     2.50%     2.50%   2.50%            
Unsecured term loan facility                   $ 350,000,000        
Weighted average interest rate on debt (as a percent)           2.50% 1.90% 2.30% 1.90%          
Interest expense and other associated costs incurred           $ 2,140,000 $ 1,635,000 $ 4,056,000 $ 3,249,000          
Maximum borrowing capacity that may be increased     $ 700,000,000     $ 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                            
Interest rate (as a percent)     3.00%     3.00%   3.00%            
Unsecured term loan facility     $ 200,000,000     $ 200,000,000   $ 200,000,000            
Weighted average interest rate on debt (as a percent)           2.90% 2.30% 2.80% 2.30%          
Term loan due 2022 | LIBOR                            
Indebtedness                            
Interest rate added to the base rate (as a percent)               1.80%            
Term loan due 2022 | Senior Living Communities                            
Indebtedness                            
Unsecured term loan facility                           $ 200,000,000
Term loan due 2022 | Subsequent Event | LIBOR                            
Indebtedness                            
Interest rate added to the base rate (as a percent) 1.35%                          
Mortgages                            
Indebtedness                            
Aggregate principal amount of mortgage debt     $ 807,775,000     $ 807,775,000   $ 807,775,000            
Number of properties mortgaged | property     24     24   24            
Number of buildings mortgaged | building     25     25   25            
Total real estate properties, gross     $ 1,232,046,000     $ 1,232,046,000   $ 1,232,046,000            
Capital leases                            
Indebtedness                            
Total real estate properties, gross     $ 36,173,000     $ 36,173,000   $ 36,173,000            
Number of properties recorded under capital lease | property     2     2   2            
Capital leases     $ 11,022,000     $ 11,022,000   $ 11,022,000            
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     1   1            
Repayments of first mortgage bond     $ 8,807,000                      
Early repayment of senior debt, debt instrument, interest rate, stated percentage     5.95%     5.95%   5.95%            
Loss on early extinguishment of debt           $ 7,353,000   $ 7,353,000            
Unsecured debt due September 2015                            
Indebtedness                            
Interest expense and other associated costs incurred           $ 1,427,000 $ 1,133,000 $ 2,725,000 $ 2,260,000          
Unsecured debt | Subsequent Event                            
Indebtedness                            
Maximum borrowing capacity that may be increased                       $ 400,000,000