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Indebtedness - Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Nov. 07, 2017
Dec. 31, 2016
Indebtedness            
Unsecured revolving credit facility, outstanding borrowings $ 458,000   $ 458,000     $ 191,000
Unsecured term loan outstanding 398,920   398,920     398,421
Senior unsecured notes, net 3,163,865   3,163,865     $ 2,565,908
Revolving credit facility and term loan            
Indebtedness            
Maximum borrowing capacity that may be increased 2,300,000   2,300,000      
Unsecured revolving credit facility            
Indebtedness            
Unsecured revolving credit facility, outstanding borrowings 458,000   458,000      
Unsecured revolving credit facility, maximum borrowing capacity $ 1,000,000   $ 1,000,000      
Extendable term of credit facility     1 year      
Credit facility fee percentage     0.20%      
Annual interest rate 2.34%   2.34%      
Weighted average interest rate 2.33% 1.60% 2.17% 1.55%    
Remaining borrowing capacity $ 542,000   $ 542,000      
Unsecured revolving credit facility | LIBOR            
Indebtedness            
Margin over base rate, in basis points (as a percent)     1.10%      
Unsecured term loan            
Indebtedness            
Unsecured term loan outstanding $ 400,000   $ 400,000      
Annual interest rate 2.44%   2.44%      
Weighted average interest rate 2.43% 1.69% 2.20% 1.65%    
Unsecured term loan | LIBOR            
Indebtedness            
Margin over base rate, in basis points (as a percent)     1.20%      
Senior unsecured notes            
Indebtedness            
Senior unsecured notes, net $ 3,200,000   $ 3,200,000      
Subsequent event | Unsecured revolving credit facility            
Indebtedness            
Unsecured revolving credit facility, outstanding borrowings         $ 330,000  
Remaining borrowing capacity         $ 670,000