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Indebtedness - Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 23, 2016
Dec. 09, 2015
Dec. 08, 2015
Indebtedness            
Unsecured revolving credit facility $ 465,000 $ 18,000        
Unsecured term loan outstanding 400,000 400,000        
Unsecured senior notes 2,422,473 2,420,613        
Convertible senior unsecured notes 8,478 $ 8,478        
Unsecured revolving credit facility            
Indebtedness            
Unsecured revolving credit facility 465,000     $ 0    
Unsecured revolving credit facility maximum borrowing capicity $ 1,000,000          
Interest rate (as a percent) 1.52%          
Weighted average interest rate for borrowings (as a percent) 1.30% 1.25% 1.50%      
Unsecured revolving credit facility | LIBOR            
Indebtedness            
Margin over base rate, in basis points (as a percent) 110.00%          
Interest rate payable for facility fees (as a percent) 20.00%          
Unsecured term loan            
Indebtedness            
Unsecured term loan outstanding $ 400,000          
Extendable term of credit facility 1 year          
Interest rate (as a percent) 1.44%          
Weighted average interest rate for borrowings (as a percent) 1.39% 1.36% 1.64%      
Unsecured term loan | LIBOR            
Indebtedness            
Margin over base rate, in basis points (as a percent) 120.00%          
Unsecured senior notes            
Indebtedness            
Unsecured senior notes $ 2,425,000          
Revolving credit facility and term loan            
Indebtedness            
Unsecured revolving credit facility maximum borrowing capicity         $ 1,000,000 $ 750,000
Maximum borrowing capacity that may be increased 2,300,000          
Convertible Senior Notes, due 2027 at 3.8% | Unsecured senior notes            
Indebtedness            
Convertible senior unsecured notes $ 8,478