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Unsecured Senior Notes - Summary of Unsecured Financing Agreements (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 15, 2021
Jul. 31, 2021
Sep. 30, 2021
Sep. 30, 2021
Jul. 14, 2021
Dec. 31, 2020
Mar. 29, 2017
Unsecured Senior Notes              
Unsecured Senior Notes              
Long term debt, gross     $ 1,750,000 $ 1,750,000   $ 1,750,000  
Unamortized deferred financing costs     (6,960) (6,960)   (5,589)  
Unsecured senior notes     1,733,684 1,733,684   1,732,520  
Carrying amount of conversion option equity components recorded in additional paid-in capital for outstanding convertible notes           3,755  
Convertible Senior Notes              
Unsecured Senior Notes              
Unamortized discount     (690) (690)   (2,559)  
Senior Notes              
Unsecured Senior Notes              
Unamortized discount     $ (8,666) $ (8,666)   (9,332)  
2021 Senior Notes              
Unsecured Senior Notes              
Coupon Rate     5.00% 5.00%      
Effective Rate     5.32% 5.32%      
Remaining Period of Amortization       2 months 12 days      
Long term debt, gross     $ 300,000 $ 300,000   700,000  
Redemption of notes $ 400,000            
2023 Senior Notes              
Unsecured Senior Notes              
Coupon Rate     5.50% 5.50%      
Effective Rate     5.71% 5.71%      
Remaining Period of Amortization       2 years 1 month 6 days      
Long term debt, gross     $ 300,000 $ 300,000   300,000  
2023 Convertible Notes              
Unsecured Senior Notes              
Coupon Rate     4.38% 4.38%     4.375%
Effective Rate     4.57% 4.57%      
Remaining Period of Amortization       1 year 6 months      
Long term debt, gross     $ 250,000 $ 250,000   250,000  
2025 Senior Notes              
Unsecured Senior Notes              
Coupon Rate     4.75% 4.75%      
Effective Rate     5.04% 5.04%      
Remaining Period of Amortization       3 years 6 months      
Long term debt, gross     $ 500,000 $ 500,000   500,000  
2026 Senior Notes              
Unsecured Senior Notes              
Coupon Rate     3.63% 3.63% 3.625%    
Effective Rate     3.77% 3.77%      
Remaining Period of Amortization       4 years 9 months 18 days      
Long term debt, gross     $ 400,000 $ 400,000   $ 0  
LIBOR              
Unsecured Senior Notes              
Pricing margin   2.22%          
LIBOR | 2025 Senior Notes              
Unsecured Senior Notes              
Long term debt, gross     $ 470,000 $ 470,000      
Pricing margin     2.53%