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Indebtedness - Principal Repayment (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 03, 2016
Mar. 31, 2016
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        
Loss on extinguishment of debt       855        
Issuance of senior notes     2,413,995 2,412,135        
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses       $ 690,071 $ 299,661      
Required principal payments under outstanding debt                
2016     275,000          
2017     300,000          
2018     815,000          
2019     400,000          
Thereafter     1,508,478          
Total principal payments     3,298,478          
Unsecured revolving credit facility                
Indebtedness                
Unsecured revolving credit facility     465,000     $ 0    
Unsecured revolving credit facility maximum borrowing capicity     1,000,000          
Amount available under revolving credit facility     $ 535,000     $ 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 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%      
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          
Unsecured senior notes                
Indebtedness                
Unsecured senior notes     $ 2,425,000          
Issuance of senior notes $ 750,000              
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses 732,288              
Senior Notes, due 2016 at 6.3%                
Indebtedness                
Interest rate stated percentage     6.30% 6.30%        
Senior Notes, due 2016 at 6.3% | Forecast                
Indebtedness                
Interest rate (as a percent)   6.30%            
Debt redeemed   $ 275,000            
Senior Notes, due 2017 at 5.625%                
Indebtedness                
Interest rate stated percentage     5.625% 5.625%        
Senior Notes, due 2018 at 6.7%                
Indebtedness                
Interest rate stated percentage     6.70% 6.70%        
Senior Notes, due 2022 at 5.0%                
Indebtedness                
Interest rate stated percentage     5.00% 5.00%        
Senior Notes, due 2023 at 4.5%                
Indebtedness                
Interest rate stated percentage     4.50% 4.50%        
Senior Notes, due 2024 at 4.65%                
Indebtedness                
Interest rate stated percentage     4.65% 4.65%        
Senior Notes, due 2025 at 4.5%                
Indebtedness                
Interest rate stated percentage     4.50% 4.50%        
Senior Notes, due 2021 at 4.25% | Unsecured senior notes                
Indebtedness                
Issuance of senior notes $ 400,000              
Interest rate stated percentage 4.25%              
Senior Notes, due 2026 at 5.25% | Unsecured senior notes                
Indebtedness                
Issuance of senior notes $ 350,000              
Interest rate stated percentage 5.25%              
Convertible Senior Notes, due 2027 at 3.8%                
Indebtedness                
Interest rate stated percentage     3.80% 3.80%        
Convertible Senior Notes, due 2027 at 3.8% | Unsecured senior notes                
Indebtedness                
Convertible senior unsecured notes     $ 8,478          
Interest rate stated percentage     3.80%          
Initial exchange price (In dollars per share)     $ 50.50