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Indebtedness (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Nov. 08, 2015
Dec. 31, 2014
Indebtedness              
Unsecured revolving credit facility $ 454,000     $ 454,000     $ 18,000
Convertible senior unsecured notes 8,478     8,478     $ 8,478
Unsecured revolving credit facility              
Indebtedness              
Unsecured revolving credit facility 454,000     454,000      
Unsecured revolving credit facility maximum borrowing capicity $ 750,000     $ 750,000      
Extendable term of credit facility       1 year      
Debt instrument, interest rate description     LIBOR        
Margin over base rate, in basis points (as a percent)       1.10%      
Interest rate payable for facility fees (as a percent)       0.20%      
Interest rate (as a percent) 1.29%     1.29%      
Weighted average interest rate for borrowings (as a percent) 1.30% 1.26%   1.28% 1.25%    
Unsecured revolving credit facility | Subsequent event              
Indebtedness              
Unsecured revolving credit facility           $ 384,000  
Unsecured term loan              
Indebtedness              
Unsecured term loan outstanding $ 400,000     $ 400,000      
Debt instrument, interest rate description       LIBOR      
Margin over base rate, in basis points (as a percent)       1.20%      
Interest rate (as a percent) 1.40%     1.40%      
Weighted average interest rate for borrowings (as a percent) 1.39% 1.35%   1.38% 1.36%    
Unsecured senior notes              
Indebtedness              
Unsecured senior notes $ 2,425,000     $ 2,425,000      
Revolving credit facility and term loan              
Indebtedness              
Maximum borrowing capacity that may be increased 2,300,000     2,300,000      
Convertible Senior Notes, due 2027 at 3.8%              
Indebtedness              
Convertible senior unsecured notes $ 8,478     $ 8,478