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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,061,192	$ 815,647
Allowance for Expected Credit Losses	(489)	(186)	$ 0
Gross Unrealized Gains	1,129	5,465
Gross Unrealized Losses	(21,377)	(1,065)
Fair Value	1,040,455	819,861
U.S. government obligations and agencies | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27,076	59,529
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	64	157
Gross Unrealized Losses	(334)	(55)
Fair Value	26,806	59,631
Corporate bonds | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	687,058	416,758
Allowance for Expected Credit Losses	(371)	(148)
Gross Unrealized Gains	843	3,571
Gross Unrealized Losses	(13,725)	(337)
Fair Value	673,805	419,844
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	322,844	319,377
Fair Value	316,118	319,937
Mortgage-backed and asset-backed securities | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	322,844	319,377
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	194	1,175
Gross Unrealized Losses	(6,920)	(615)
Fair Value	316,118	319,937
Municipal bonds | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,925	11,990
Allowance for Expected Credit Losses	(1)	0
Gross Unrealized Gains	0	138
Gross Unrealized Losses	(350)	0
Fair Value	14,574	12,128
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Allowance for Expected Credit Losses	(117)	(38)	$ 0
Redeemable preferred stock | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,289	7,993
Allowance for Expected Credit Losses	(117)	(38)
Gross Unrealized Gains	28	424
Gross Unrealized Losses	(48)	(58)
Fair Value	$ 9,152	$ 8,321

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