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Indebtedness - Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Nov. 08, 2016
Feb. 03, 2016
Dec. 31, 2015
Indebtedness              
Unsecured revolving credit facility, outstanding borrowings $ 150,000   $ 150,000       $ 465,000
Senior unsecured notes, net 2,564,476   2,564,476       2,403,439
Convertible senior unsecured notes, outstanding principal amount 8,478   8,478       $ 8,478
Unsecured term loan              
Indebtedness              
Unsecured term loan outstanding $ 400,000   $ 400,000        
Annual interest rate 1.72%   1.72%        
Weighted average interest rate 1.69% 1.39% 1.65% 1.38%      
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 $ 150,000   $ 150,000        
Unsecured revolving credit facility, maximum borrowing capacity $ 1,000,000   $ 1,000,000        
Extendable term of credit facility     1 year        
Annual interest rate 1.62%   1.62%        
Weighted average interest rate 1.60% 1.30% 1.55% 1.28%      
Unsecured revolving credit facility | LIBOR              
Indebtedness              
Margin over base rate, in basis points (as a percent)     1.10%        
Interest rate payable for facility fees (as a percent)     0.20%        
Revolving credit facility and term loan              
Indebtedness              
Maximum borrowing capacity that may be increased $ 2,300,000   $ 2,300,000        
Senior unsecured notes              
Indebtedness              
Unsecured term loan outstanding           $ 750,000  
Senior unsecured notes, net 2,600,000   2,600,000        
Convertible unsecured Senior notes              
Indebtedness              
Convertible senior unsecured notes, outstanding principal amount $ 8,478   $ 8,478        
Subsequent Event | Unsecured revolving credit facility              
Indebtedness              
Unsecured revolving credit facility, outstanding borrowings         $ 70,000