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Debt - Narrative (Details)
$ / shares in Units, shares in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
Debt Instrument [Line Items]    
Loss on debt extinguishment $ 22,107,000 $ 0
Federal Home Loan Bank advance prepayment amount 156,300,000  
Total interest payments $ 26,700,000 $ 25,100,000
Senior Notes | 5.75% Senior Notes Due 2023    
Debt Instrument [Line Items]    
Stated interest rate 5.75%  
Senior Notes | 5.25% Senior Notes Due 2028    
Debt Instrument [Line Items]    
Stated interest rate 5.25%  
9% Convertible Junior Subordinated Debentures    
Debt Instrument [Line Items]    
Conversion rate (in shares per $1,000 note) 0.0765496  
Principal amount of notes used in determining conversion rate $ 1,000  
Convertible debt, conversion price (in dollars per share) | $ / shares $ 13.06  
Stated interest rate 9.00%  
Extinguishment of debt, amount $ 57,000,000  
Repurchases of convertible junior subordinated debentures 77,700,000  
Loss on debt extinguishment $ 20,800,000  
Reduction in potentially dilutive shares due to debt extinguishment | shares 4.4  
Federal Home Loan Bank Advances (FHLB)    
Debt Instrument [Line Items]    
Stated interest rate 1.91%  
Loss on debt extinguishment $ 1,300,000