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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,039,042	$ 815,647
Allowance for Expected Credit Losses	(290)	(186)	$ 0
Gross Unrealized Gains	2,121	5,465
Gross Unrealized Losses	(11,716)	(1,065)
Fair Value	1,029,157	819,861
U.S. government obligations and agencies | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,291	59,529
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	102	157
Gross Unrealized Losses	(277)	(55)
Fair Value	37,116	59,631
Corporate bonds | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	640,855	416,758
Allowance for Expected Credit Losses	(236)	(148)
Gross Unrealized Gains	1,435	3,571
Gross Unrealized Losses	(7,562)	(337)
Fair Value	634,492	419,844
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	336,881	319,377
Fair Value	333,754	319,937
Mortgage-backed and asset-backed securities | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	336,881	319,377
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	493	1,175
Gross Unrealized Losses	(3,620)	(615)
Fair Value	333,754	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	1	138
Gross Unrealized Losses	(244)	0
Fair Value	14,681	12,128
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Allowance for Expected Credit Losses	(53)	(38)	$ 0
Redeemable preferred stock | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,090	7,993
Allowance for Expected Credit Losses	(53)	(38)
Gross Unrealized Gains	90	424
Gross Unrealized Losses	(13)	(58)
Fair Value	$ 9,114	$ 8,321

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