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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) $ in Thousands	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	107	404
Less than 12 months, Fair value	$ 82,130	$ 682,402
Less than 12 months, Unrealized losses	$ (6,045)	$ (13,818)
12 months or longer, Number of issues | security	401	33
12 months or longer, Fair value	$ 560,745	$ 45,645
12 months or longer, Unrealized losses	$ (85,470)	$ (1,853)
U.S. government obligations and agencies | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	2	4
Less than 12 months, Fair value	$ 2,721	$ 18,913
Less than 12 months, Unrealized losses	$ (110)	$ (111)
12 months or longer, Number of issues | security	5	4
12 months or longer, Fair value	$ 8,943	$ 5,016
12 months or longer, Unrealized losses	$ (828)	$ (223)
Corporate bonds | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	40	249
Less than 12 months, Fair value	$ 26,563	$ 378,595
Less than 12 months, Unrealized losses	$ (2,910)	$ (7,468)
12 months or longer, Number of issues | security	247	18
12 months or longer, Fair value	$ 325,992	$ 17,356
12 months or longer, Unrealized losses	$ (46,451)	$ (679)
Mortgage-backed and asset-backed securities | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	64	145
Less than 12 months, Fair value	$ 52,751	$ 274,883
Less than 12 months, Unrealized losses	$ (2,974)	$ (5,969)
12 months or longer, Number of issues | security	146	11
12 months or longer, Fair value	$ 219,189	$ 23,273
12 months or longer, Unrealized losses	$ (36,733)	$ (951)
Municipal bonds | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	0	5
Less than 12 months, Fair value	$ 0	$ 9,811
Less than 12 months, Unrealized losses	$ 0	$ (269)
12 months or longer, Number of issues | security	3	0
12 months or longer, Fair value	$ 6,621	$ 0
12 months or longer, Unrealized losses	$ (1,458)	$ 0
Redeemable preferred stock | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	1	1
Less than 12 months, Fair value	$ 95	$ 200
Less than 12 months, Unrealized losses	$ (51)	$ (1)
12 months or longer, Number of issues | security	0	0
12 months or longer, Fair value	$ 0	$ 0
12 months or longer, Unrealized losses	$ 0	$ 0

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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