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DEBT OBLIGATIONS - Senior Notes (Details) - USD ($)
1 Months Ended
Mar. 31, 2021
Oct. 31, 2020
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Outstanding balance     $ 1,408,751,000 $ 712,466,000
Unsecured term loan        
Debt Instrument [Line Items]        
Outstanding balance     1,084,654,000 $ 491,255,000
Unsecured term loan | 6.50% Senior Unsecured Notes Due 2025        
Debt Instrument [Line Items]        
Face amount   $ 500,000,000    
Stated interest rate   6.50%    
Redemption price, percentage   100.00%    
Outstanding balance     492,800,000  
Deferred financing costs     7,200,000  
Unsecured term loan | 6.50% Senior Unsecured Notes Due 2025 | Any time prior to November 1, 2022        
Debt Instrument [Line Items]        
Redemption price, percentage   106.50%    
Percentage of principal amount to be redeemed   40.00%    
Unsecured term loan | 6.125% Senior Unsecured Notes Due 2028        
Debt Instrument [Line Items]        
Face amount $ 600,000,000      
Stated interest rate 6.125%      
Redemption price, percentage 100.00%      
Outstanding balance     591,900,000  
Deferred financing costs     $ 8,100,000  
Unsecured term loan | 6.125% Senior Unsecured Notes Due 2028 | Any time prior to April 1, 2024        
Debt Instrument [Line Items]        
Redemption price, percentage 106.125%      
Percentage of principal amount to be redeemed 40.00%