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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) $ in Thousands	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	404	79
Less than 12 months, Fair value	$ 682,402	$ 173,670
Less than 12 months, Unrealized losses	$ (13,818)	$ (844)
12 months or longer, Number of issues | security	33	0
12 months or longer, Fair value	$ 45,645	$ 0
12 months or longer, Unrealized losses	$ (1,853)	$ 0
U.S. government obligations and agencies | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	4	8
Less than 12 months, Fair value	$ 18,913	$ 31,729
Less than 12 months, Unrealized losses	$ (111)	$ (55)
12 months or longer, Number of issues | security	4	0
12 months or longer, Fair value	$ 5,016	$ 0
12 months or longer, Unrealized losses	$ (223)	$ 0
Corporate bonds | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	249	27
Less than 12 months, Fair value	$ 378,595	$ 28,791
Less than 12 months, Unrealized losses	$ (7,468)	$ (162)
12 months or longer, Number of issues | security	18	0
12 months or longer, Fair value	$ 17,356	$ 0
12 months or longer, Unrealized losses	$ (679)	$ 0
Mortgage-backed and asset-backed securities | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	145	42
Less than 12 months, Fair value	$ 274,883	$ 112,462
Less than 12 months, Unrealized losses	$ (5,969)	$ (615)
12 months or longer, Number of issues | security	11	0
12 months or longer, Fair value	$ 23,273	$ 0
12 months or longer, Unrealized losses	$ (951)	$ 0
Municipal bonds | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	5	0
Less than 12 months, Fair value	$ 9,811	$ 0
Less than 12 months, Unrealized losses	$ (269)	$ 0
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
Redeemable preferred stock | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	1	2
Less than 12 months, Fair value	$ 200	$ 688
Less than 12 months, Unrealized losses	$ (1)	$ (12)
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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