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Indebtedness - Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Aug. 08, 2016
Dec. 31, 2015
Indebtedness            
Unsecured revolving credit facility $ 232,000   $ 232,000     $ 465,000
Convertible senior unsecured notes 8,478   8,478     $ 8,478
Unsecured revolving credit facility            
Indebtedness            
Unsecured revolving credit facility 232,000   232,000   $ 167,000  
Unsecured revolving credit facility maximum borrowing capacity $ 1,000,000   $ 1,000,000      
Interest rate (as a percent) 1.56%   1.56%      
Weighted average interest rate for borrowings (as a percent) 1.54% 1.28% 1.54% 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%      
unsecured term loan            
Indebtedness            
Unsecured term loan outstanding $ 400,000   $ 400,000      
Extendable term of credit facility     1 year      
Interest rate (as a percent) 1.66%   1.66%      
Weighted average interest rate for borrowings (as a percent) 1.64% 1.38% 1.63% 1.38%    
unsecured term loan | LIBOR            
Indebtedness            
Margin over base rate, in basis points (as a percent)     1.20%      
Senior unsecured notes            
Indebtedness            
Unsecured senior notes $ 2,900,000   $ 2,900,000      
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% | Senior unsecured notes            
Indebtedness            
Convertible senior unsecured notes $ 8,478   $ 8,478