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Senior Notes, Convertible Notes and Trust Preferred Securities - Schedule of Long-term Debt Instruments (Details) - Senior Notes - USD ($)
Dec. 31, 2021
Aug. 31, 2021
Dec. 31, 2020
Aug. 31, 2020
Debt Instrument [Line Items]        
Principal amount of debt component $ 998,932,000   $ 787,688,000  
Unamortized debt discounts (3,655,000)   (3,491,000)  
Unamortized debt issuance costs (7,346,000)   (4,922,000)  
Long-term debt 987,931,000   779,275,000  
Senior Notes Due 2031        
Debt Instrument [Line Items]        
Principal amount of debt component $ 400,000,000   0  
Unamortized debt discounts   $ (968,000)    
Interest Rate 2.375%      
Issue Price 99.758%      
Senior Notes Due 2030        
Debt Instrument [Line Items]        
Principal amount of debt component $ 400,000,000   400,000,000  
Unamortized debt discounts       $ (3,068,000)
Interest Rate 2.70%      
Issue Price 99.233%      
Senior Notes Due 2024        
Debt Instrument [Line Items]        
Principal amount of debt component $ 198,932,000   198,932,000  
Interest Rate 4.40%      
Issue Price 99.883%      
Senior Notes Due 2023        
Debt Instrument [Line Items]        
Principal amount of debt component $ 0   $ 188,756,000  
Interest Rate 4.25%      
Issue Price 99.026%