Debt, net - Narrative (Details) - USD ($)			1 Months Ended	12 Months Ended
	Oct. 16, 2017	Jun. 20, 2007	May 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Oct. 06, 2023	Sep. 20, 2023	Jan. 31, 2023	Oct. 21, 2022	Oct. 16, 2020
Debt Instrument [Line Items]
Long-term debt				$ 411,488,000	$ 268,082,000
Repayment of debt				1,288,119,000	2,666,098,000	$ 3,993,364,000
Insurance | Operating segments
Debt Instrument [Line Items]
Long-term debt				357,138,000	220,628,000
Corporate debt
Debt Instrument [Line Items]
Long-term debt				290,000,000	160,000,000
Corporate debt | 8.50% Junior subordinated notes
Debt Instrument [Line Items]
Long-term debt				$ 125,000,000	$ 125,000,000
Debt, face amount	$ 125,000,000
Stated interest rate, percentage	8.50%			8.50%	8.50%
Potential deferred interest periods	5 years
Corporate debt | Preferred trust securities
Debt Instrument [Line Items]
Long-term debt				$ 35,000,000	$ 35,000,000
Debt, face amount		$ 35,000,000
Corporate debt | Preferred trust securities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		4.10%
Corporate debt | Insurance | Operating segments
Debt Instrument [Line Items]
Long-term debt				290,000,000	160,000,000
Corporate debt | Insurance | Operating segments | 8.50% Junior subordinated notes
Debt Instrument [Line Items]
Long-term debt				125,000,000	125,000,000
Corporate debt | Insurance | Operating segments | Preferred trust securities
Debt Instrument [Line Items]
Long-term debt				35,000,000	35,000,000
Corporate debt | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt				130,000,000	0
Corporate debt | Revolving credit facility | Insurance
Debt Instrument [Line Items]
Maximum borrowing capacity				200,000,000	200,000,000					$ 200,000,000
Sub-limit of swing loans										$ 25,000,000
Corporate debt | Revolving credit facility | Insurance | Operating segments
Debt Instrument [Line Items]
Long-term debt				130,000,000	0
Asset based debt
Debt Instrument [Line Items]
Long-term debt				121,488,000	108,082,000
Asset based debt | Residential mortgage warehouse borrowings
Debt Instrument [Line Items]
Long-term debt				54,350,000	47,454,000
Asset based debt | Residential mortgage warehouse borrowings, $60,000 LIC
Debt Instrument [Line Items]
Debt, face amount					60,000,000				$ 60,000,000
Asset based debt | Residential mortgage warehouse borrowings, due August 2024
Debt Instrument [Line Items]
Debt, face amount								$ 65,000,000
Asset based debt | Vessel backed term loan
Debt Instrument [Line Items]
Repayment of debt			$ 13,050,000
Gain on extinguishment of debt					1,168,000
Asset based debt | Insurance | Operating segments
Debt Instrument [Line Items]
Long-term debt				67,138,000	60,628,000
Asset based debt | Insurance | Operating segments | Residential mortgage warehouse borrowings
Debt Instrument [Line Items]
Long-term debt				0	0
Asset based debt | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt				67,138,000	60,628,000
Maximum borrowing capacity							$ 125,000,000		$ 100,000,000		$ 75,000,000
Debt term							3 years				3 years
Asset based debt | Revolving credit facility | Asset Based Debt, Premium Finance Business
Debt Instrument [Line Items]
Extension limit											$ 20,000,000
Asset based debt | Revolving credit facility | Asset Based Debt, Warranty Service Contract Finance Business
Debt Instrument [Line Items]
Extension limit											$ 55,000,000
Asset based debt | Revolving credit facility | Insurance | Operating segments
Debt Instrument [Line Items]
Long-term debt				$ 67,138,000	$ 60,628,000