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Senior Notes (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
May 31, 2018
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]          
Redemption period     180 days    
Senior Notes 4.25%          
Debt Instrument [Line Items]          
Debt instrument, term     83 years    
Senior Notes          
Debt Instrument [Line Items]          
Long-term debt measured at fair value     $ 327,700,000    
Principal amount     $ 400,000,000   $ 400,000,000
Senior Notes | Period One          
Debt Instrument [Line Items]          
Redemption price percentage 102.13%        
Senior Notes | Period Two          
Debt Instrument [Line Items]          
Redemption price percentage 101.06%        
Senior Notes | Period Four          
Debt Instrument [Line Items]          
Percentage of principal amount redeemed 40.00%        
Senior Notes | Period Five          
Debt Instrument [Line Items]          
Redemption price percentage 104.25%   101.00%    
Senior Notes | Period Six          
Debt Instrument [Line Items]          
Redemption price percentage     100.00%    
Percentage of principal amount redeemed 50.00%        
Senior Note Two | Senior Notes 4.25%          
Debt Instrument [Line Items]          
Stated interest rate percentage     4.25%    
Senior Note Two | Senior Notes          
Debt Instrument [Line Items]          
Unamortized debt issuance costs   6.20% 4.30% 6.88%  
Senior Note One | Senior Notes          
Debt Instrument [Line Items]          
Effective interest rate on unamortized debt discount     4.42%    
Unamortized debt issuance costs   6.87%   6.69%  
Principal amount     $ 400,000,000    
Stated interest rate percentage     6.625%