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Indebtedness - Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
May 09, 2017
Dec. 31, 2016
Indebtedness        
Unsecured revolving credit facility, outstanding borrowings $ 130,000     $ 191,000
Unsecured term loan outstanding 398,587     398,421
Senior unsecured notes, net 3,160,757     2,565,908
Convertible senior unsecured notes, outstanding principal amount 47     $ 8,478
Unsecured term loan        
Indebtedness        
Unsecured term loan outstanding $ 400,000      
Annual interest rate 1.98%      
Weighted average interest rate 1.98% 1.62%    
Unsecured term loan | LIBOR        
Indebtedness        
Margin over base rate, in basis points (as a percent) 1.20%      
Unsecured revolving credit facility        
Indebtedness        
Unsecured revolving credit facility, outstanding borrowings $ 130,000      
Unsecured revolving credit facility, maximum borrowing capacity $ 1,000,000      
Extendable term of credit facility 1 year      
Credit facility fee percentage 0.20%      
Annual interest rate 2.08%      
Weighted average interest rate 1.95% 1.53%    
Remaining borrowing capacity $ 870,000      
Unsecured revolving credit facility | LIBOR        
Indebtedness        
Margin over base rate, in basis points (as a percent) 1.10%      
Revolving credit facility and term loan        
Indebtedness        
Maximum borrowing capacity that may be increased $ 2,300,000      
Senior unsecured notes        
Indebtedness        
Senior unsecured notes, net 3,200,000      
Convertible unsecured senior notes        
Indebtedness        
Convertible senior unsecured notes, outstanding principal amount $ 47      
Subsequent event | Unsecured revolving credit facility        
Indebtedness        
Unsecured revolving credit facility, outstanding borrowings     $ 61,000  
Remaining borrowing capacity     $ 939,000