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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 931,174	$ 815,647
Allowance for Expected Credit Losses	(220)	(186)	$ 0
Gross Unrealized Gains	2,034	5,465
Gross Unrealized Losses	(19,857)	(1,065)
Fair Value	913,131	819,861
U.S. government obligations and agencies | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,284	59,529
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	123	157
Gross Unrealized Losses	(340)	(55)
Fair Value	40,067	59,631
Corporate bonds | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	536,479	416,758
Allowance for Expected Credit Losses	(175)	(148)
Gross Unrealized Gains	1,102	3,571
Gross Unrealized Losses	(13,077)	(337)
Fair Value	524,329	419,844
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	330,939	319,377
Fair Value	325,697	319,937
Mortgage-backed and asset-backed securities | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	330,939	319,377
Allowance for Expected Credit Losses	(2)	0
Gross Unrealized Gains	559	1,175
Gross Unrealized Losses	(5,799)	(615)
Fair Value	325,697	319,937
Municipal bonds | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,400	11,990
Allowance for Expected Credit Losses	(1)	0
Gross Unrealized Gains	0	138
Gross Unrealized Losses	(574)	0
Fair Value	15,825	12,128
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Allowance for Expected Credit Losses	(42)	(38)	$ 0
Redeemable preferred stock | Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,072	7,993
Allowance for Expected Credit Losses	(42)	(38)
Gross Unrealized Gains	250	424
Gross Unrealized Losses	(67)	(58)
Fair Value	$ 7,213	$ 8,321

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