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Indebtedness (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2018
USD ($)
Mar. 31, 2018
USD ($)
property
building
note
Mar. 31, 2017
USD ($)
May 09, 2018
USD ($)
Dec. 31, 2017
USD ($)
Indebtedness          
Number of public issues of unsecured senior notes | note   7      
Total real estate properties, gross   $ 7,958,274     $ 7,824,763
Unsecured revolving credit facility   55,000     $ 596,000
Unsecured revolving credit facility          
Indebtedness          
Unsecured revolving credit facility, maximum borrowing capacity   1,000,000      
Line of credit facility, periodic payment, principal   $ 0      
Revolving credit facility, interest rate payable (as a percent)   2.90%      
Weighted average interest rate on debt (as a percent)   2.70% 2.10%    
Unsecured revolving credit facility   $ 55,000      
Revolving credit facility, available amount   945,000      
Interest expense and other associated costs incurred   4,077 $ 2,830    
Option to increase the borrowing capacity under revolving credit facility   $ 2,000,000      
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       $ 35,000  
Revolving credit facility, available amount       $ 965,000  
Senior unsecured notes due 2019          
Indebtedness          
Debt face amount   $ 400,000      
Interest rate (as a percent)   3.25%      
Senior unsecured notes due 2020          
Indebtedness          
Debt face amount   $ 200,000      
Interest rate (as a percent)   6.75%      
Senior unsecured notes due 2021          
Indebtedness          
Debt face amount   $ 300,000      
Interest rate (as a percent)   6.75%      
Senior unsecured notes due 2024          
Indebtedness          
Debt face amount   $ 250,000      
Interest rate (as a percent)   4.75%      
Senior unsecured notes due 2028          
Indebtedness          
Debt face amount   $ 500,000      
Interest rate (as a percent) 4.75% 4.75%      
Proceeds from debt, net of issuance costs $ 487,264        
Proceeds from issuance of debt $ 500,000        
Senior unsecured notes due 2042          
Indebtedness          
Debt face amount   $ 350,000      
Interest rate (as a percent)   5.625%      
Senior unsecured notes due 2046          
Indebtedness          
Debt face amount   $ 250,000      
Interest rate (as a percent)   6.25%      
Term loan due 2020          
Indebtedness          
Debt face amount   $ 350,000      
Interest rate (as a percent)   3.10%      
Weighted average interest rate on debt (as a percent)   3.10% 2.20%    
Interest expense and other associated costs incurred   $ 2,766 $ 2,043    
Maximum borrowing capacity that may be increased   $ 700,000      
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      
Interest rate (as a percent)   3.20%      
Weighted average interest rate on debt (as a percent)   3.00% 2.60%    
Interest expense and other associated costs incurred   $ 1,564 $ 1,359    
Maximum borrowing capacity that may be increased   $ 400,000      
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   $ 818,457      
Number of properties mortgaged | property   24      
Number of buildings mortgaged | building   25      
Total real estate properties, gross   $ 1,245,304      
Capital leases          
Indebtedness          
Total real estate properties, gross   $ 36,238      
Number of properties recorded under capital lease | property   2      
Capital leases   $ 10,484