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Indebtedness (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2018
USD ($)
property
Feb. 28, 2018
USD ($)
Jun. 30, 2018
USD ($)
property
building
note
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
property
building
note
Jun. 30, 2017
USD ($)
Aug. 06, 2018
USD ($)
Jan. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Indebtedness                  
Total real estate properties, gross     $ 7,987,732,000   $ 7,987,732,000       $ 7,824,763,000
Unsecured revolving credit facility     64,000,000   64,000,000       $ 596,000,000
Unsecured revolving credit facility                  
Indebtedness                  
Unsecured revolving credit facility, maximum borrowing capacity     $ 1,000,000,000   $ 1,000,000,000        
Number of public issues of unsecured senior notes | note     7   7        
Line of credit facility, periodic payment, principal         $ 0        
Revolving credit facility, interest rate payable (as a percent)     3.20%   3.20%        
Weighted average interest rate on debt (as a percent)     3.00% 2.30% 2.70% 2.20%      
Unsecured revolving credit facility     $ 64,000,000   $ 64,000,000        
Revolving credit facility, available amount     936,000,000   936,000,000        
Interest expense and other associated costs incurred     1,504,000 $ 3,129,000 5,581,000 $ 5,959,000      
Option to increase the borrowing capacity under revolving credit facility (up to)     2,000,000,000   $ 2,000,000,000        
Unsecured revolving credit facility | LIBOR                  
Indebtedness                  
Interest rate added to the base rate (as a percent)         1.20%        
Debt instrument, facility fee (as a percent)         0.25%        
Unsecured revolving credit facility | Subsequent Event                  
Indebtedness                  
Unsecured revolving credit facility             $ 125,000,000    
Revolving credit facility, available amount             $ 875,000,000    
Senior unsecured notes due 2019                  
Indebtedness                  
Debt face amount     $ 400,000,000   $ 400,000,000        
Interest rate (as a percent)     3.25%   3.25%        
Senior unsecured notes due 2020                  
Indebtedness                  
Debt face amount     $ 200,000,000   $ 200,000,000        
Interest rate (as a percent)     6.75%   6.75%        
Senior unsecured notes due 2021                  
Indebtedness                  
Debt face amount     $ 300,000,000   $ 300,000,000        
Interest rate (as a percent)     6.75%   6.75%        
Senior unsecured notes due 2024                  
Indebtedness                  
Debt face amount     $ 250,000,000   $ 250,000,000        
Interest rate (as a percent)     4.75%   4.75%        
Senior unsecured notes due 2028                  
Indebtedness                  
Debt face amount     $ 500,000,000   $ 500,000,000        
Interest rate (as a percent)   4.75% 4.75%   4.75%        
Proceeds from issuance of debt   $ 500,000,000              
Proceeds from debt, net of issuance costs   $ 487,264,000              
Senior unsecured notes due 2042                  
Indebtedness                  
Debt face amount     $ 350,000,000   $ 350,000,000        
Interest rate (as a percent)     5.625%   5.625%        
Senior unsecured notes due 2046                  
Indebtedness                  
Debt face amount     $ 250,000,000   $ 250,000,000        
Interest rate (as a percent)     6.25%   6.25%        
Term loan due 2020                  
Indebtedness                  
Debt face amount     $ 350,000,000   $ 350,000,000        
Interest rate (as a percent)     3.40%   3.40%        
Weighted average interest rate on debt (as a percent)     3.40% 2.50% 3.20% 2.30%      
Interest expense and other associated costs incurred     $ 3,077,000 $ 2,268,000 $ 5,843,000 $ 4,311,000      
Maximum borrowing capacity that may be increased (up to)     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                  
Debt face amount     $ 200,000,000   $ 200,000,000        
Interest rate (as a percent)     3.40%   3.40%        
Weighted average interest rate on debt (as a percent)     3.30% 2.90% 3.20% 2.80%      
Interest expense and other associated costs incurred     $ 1,738,000 $ 1,488,000 $ 3,302,000 $ 2,847,000      
Maximum borrowing capacity that may be increased (up to)     400,000,000   $ 400,000,000        
Term loan due 2022 | LIBOR                  
Indebtedness                  
Interest rate added to the base rate (as a percent)         1.35%        
Mortgages                  
Indebtedness                  
Aggregate principal amount of mortgage debt     $ 833,594,000   $ 833,594,000        
Number of properties mortgaged | property     26   26        
Number of buildings mortgaged | building     27   27        
Total real estate properties, gross     $ 1,266,093,000   $ 1,266,093,000        
Capital leases                  
Indebtedness                  
Total real estate properties, gross     $ 36,248,000   $ 36,248,000        
Number of properties recorded under capital lease | property     2   2        
Capital leases     $ 10,270,000   $ 10,270,000        
Mortgage loan due 2043                  
Indebtedness                  
Debt face amount               $ 4,338  
Interest rate (as a percent)               4.38%  
Senior unsecured notes due 2018 | Subsequent Event                  
Indebtedness                  
Debt face amount $ 90,602,000                
Number of properties mortgaged | property 12                
Weighted average interest rate on debt (as a percent) 5.00%                
Senior unsecured notes due 2019 | Subsequent Event                  
Indebtedness                  
Debt face amount $ 6,360,000                
Interest rate (as a percent) 4.69%