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Debt (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 31, 2021
Debt Instrument [Line Items]        
Principal amount $ 2,364,513,000 $ 2,610,246,000    
Loss on debt refinancing 56,209,000 36,987,000 $ 6,623,000  
Interest rate swaps        
Debt Instrument [Line Items]        
Total notional amount of outstanding contracts 200,000,000 500,000,000    
Gain on termination of derivative 2,000,000      
Derivative, amount terminated 500,000,000      
Notes due        
Debt Instrument [Line Items]        
Loss on debt refinancing 56,000,000      
Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Principal amount 380,000,000      
Maximum borrowing capacity 500,000,000      
Borrowings under facility 0      
Interest rate swaps        
Debt Instrument [Line Items]        
Total notional amount of outstanding contracts $ 200,000,000     $ 500,000,000
Fixed interest rate 0.56%      
Notes due March 2027 | Notes due        
Debt Instrument [Line Items]        
Principal amount $ 400,000,000 0    
Interest rate 6.875%      
Notes due March 2029 | Notes due        
Debt Instrument [Line Items]        
Principal amount $ 350,000,000 0    
Interest rate 7.25%      
Term loan due March 2028 | Notes due        
Debt Instrument [Line Items]        
Interest rate 4.10%      
Debt term 7 years      
Face amount $ 450,000,000      
Notes due May 2022 | Notes due        
Debt Instrument [Line Items]        
Principal amount $ 0 148,792,000    
Interest rate 5.625%      
Purchase of debt $ 363,000,000      
Notes due April 2023 | Notes due        
Debt Instrument [Line Items]        
Principal amount $ 90,259,000 271,000,000    
Interest rate 6.20%      
Purchase of debt $ 363,000,000      
Notes due March 2024 | Notes due        
Debt Instrument [Line Items]        
Principal amount $ 242,603,000 $ 374,000,000    
Interest rate 4.625%      
Purchase of debt $ 363,000,000      
Term Loan Due March 2026 | Notes due        
Debt Instrument [Line Items]        
Interest rate 1.90%