Debt - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023
FHLB of Indianapolis
Debt Instrument [Line Items]
Debt issuance costs	$ 24,946,000	$ 25,061,000
Senior Unsecured Notes | FHLB of Indianapolis
Debt Instrument [Line Items]
Debt issuance costs	16,296,000	16,208,000
Senior Unsecured Notes | 9.75% Public Senior Unsecured Notes (New Public Notes)
Debt Instrument [Line Items]
Face amount of debt	$ 17,900,000		$ 17,900,000
Maturity date	Sep. 30, 2028
Interest rate	9.75%		9.75%
Interest rate, payment terms	interest rate of 9.75% per annum, payable quarterly at the end of March, June, September and December
Debt issuance costs	$ 1,600,000
Senior Unsecured Notes | 6.75% Public Senior Unsecured notes (Old Public Notes)
Debt Instrument [Line Items]
Interest rate	6.75%
Senior Secured Notes
Debt Instrument [Line Items]
Call premium	$ 1,800,000
Outstanding debt	9,500,000
Senior Secured Notes | FHLB of Indianapolis
Debt Instrument [Line Items]
Debt issuance costs	8,650,000	8,853,000
Senior Secured Notes | Privately Placed 12.5% Senior Secured Notes
Debt Instrument [Line Items]
Face amount of debt	$ 9,500,000
Maturity date			Sep. 30, 2028
Interest rate	12.50%		12.50%
Quarterly payment of principal	$ 250,000
Call premium percentage	22.00%
Concession made to the lender	$ 0
Debt issuance costs		$ 850,000
Restructuring costs incurred	$ 173,000