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Indebtedness (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2016
USD ($)
loan
building
property
Apr. 30, 2016
USD ($)
property
Feb. 29, 2016
USD ($)
Jan. 31, 2016
USD ($)
property
Sep. 30, 2015
Jun. 30, 2016
USD ($)
property
building
item
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
property
building
item
Jun. 30, 2015
USD ($)
Aug. 04, 2016
USD ($)
Dec. 31, 2015
USD ($)
Indebtedness                      
Number of public issues of unsecured senior notes | item           6   6      
Principal amount of unsecured senior notes           $ 1,721,306,000   $ 1,721,306,000     $ 1,478,536,000
Aggregate principal amount of mortgage debt           636,087,000   636,087,000      
Carrying value of mortgaged properties           6,418,923,000   6,418,923,000     6,309,400,000
Unsecured revolving credit facility           749,000,000   749,000,000     $ 775,000,000
Loss on early extinguishment of debt             $ (39,000) (6,000) $ (1,448,000)    
Unsecured revolving credit facility                      
Indebtedness                      
Unsecured revolving credit facility, maximum borrowing capacity           1,000,000,000   1,000,000,000      
Option to increase the borrowing capacity under revolving credit facility           $ 1,500,000   $ 1,500,000      
Revolving credit facility, interest rate payable (as a percent)           1.70%   1.70%      
Interest expense and other associated costs incurred           $ 3,454,000 $ 2,063,000 $ 7,136,000 $ 3,003,000    
Unsecured revolving credit facility           $ 749,000,000   $ 749,000,000   $ 100,000,000  
Weighted average interest rate on debt (as a percent)           1.70% 1.50% 1.70% 1.50%    
Revolving credit facility, available amount           $ 251,000,000   $ 251,000,000   $ 900,000,000  
Unsecured revolving credit facility | LIBOR                      
Indebtedness                      
Interest rate added to the base rate (as a percent)               130.00%      
Debt instrument, facility fee (as a percent)               30.00%      
Senior unsecured notes due 2019                      
Indebtedness                      
Principal amount of unsecured senior notes           $ 400,000,000   $ 400,000,000      
Interest rate (as a percent)           3.25%   3.25%      
Senior unsecured notes 6.75%                      
Indebtedness                      
Principal amount of unsecured senior notes           $ 200,000,000   $ 200,000,000      
Interest rate (as a percent)           6.75%   6.75%      
Unsecured senior notes due 2021                      
Indebtedness                      
Principal amount of unsecured senior notes           $ 300,000,000   $ 300,000,000      
Interest rate (as a percent)           6.75%   6.75%      
Senior unsecured notes due 2024                      
Indebtedness                      
Principal amount of unsecured senior notes           $ 250,000,000   $ 250,000,000      
Interest rate (as a percent)           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      
Interest rate (as a percent)           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      
Interest rate (as a percent)     6.25%     6.25%   6.25%      
Sale of senior unsecured notes     $ 250,000,000                
Net proceeds after underwriting discounts from sale of senior unsecured notes     $ 241,350,000                
Mortgages                      
Indebtedness                      
Number of properties mortgaged | property 1 1   1   54   54      
Number of buildings mortgaged | building           55   55      
Carrying value of mortgaged properties           $ 1,040,792,000   $ 1,040,792,000      
Weighted average interest rate on prepaid debt (as a percent) 6.25% 4.65%   5.97%              
Prepayment of mortgage $ 11,871,000 $ 18,000,000   $ 6,115,000              
Capital leases                      
Indebtedness                      
Carrying value of mortgaged properties           $ 36,039,000   $ 36,039,000      
Number of properties recorded under capital lease | property           2   2      
Capital leases           $ 11,817,000   $ 11,817,000      
Unsecured Debt                      
Indebtedness                      
Weighted average interest rate on debt (as a percent)           2.30%   2.30%      
Unsecured Debt | LIBOR                      
Indebtedness                      
Interest rate added to the base rate (as a percent)         180.00%     140.00%      
Term Loan Due 2020                      
Indebtedness                      
Interest rate (as a percent)           1.90%   1.90%      
Unsecured term loan facility           $ 350,000,000   $ 350,000,000      
Interest expense and other associated costs incurred           $ 1,635,000 $ 1,449,000 $ 3,249,000 $ 2,823,000    
Weighted average interest rate on debt (as a percent)           1.90% 1.60% 1.90% 1.60%    
Maximum borrowing capacity that may be increased           $ 700,000,000   $ 700,000,000      
Term Loan Due 2022                      
Indebtedness                      
Principal amount of unsecured senior notes           200,000,000   200,000,000      
Unsecured term loan facility           200,000,000   $ 200,000,000      
Weighted average interest rate on debt (as a percent)               2.30%      
Maximum borrowing capacity that may be increased           400,000,000   $ 400,000,000      
Unsecured Debt September 2015                      
Indebtedness                      
Interest expense and other associated costs incurred           $ 1,133,000   $ 2,260,000      
Prepayment Notification | Mortgages                      
Indebtedness                      
Number of properties mortgaged | loan 2                    
Weighted average interest rate on prepaid debt (as a percent) 5.92%                    
Number of mortgage notes | loan 2                    
Prepayment of mortgage $ 79,957,000                    
MOBs | Secured debt financing due 2026                      
Indebtedness                      
Aggregate principal amount of mortgage debt $ 620,000,000                    
Number of properties mortgaged | property 1                    
Number of buildings mortgaged | building 2                    
Weighted average interest rate on debt (as a percent) 3.53%