DISCONTINUED OPERATIONS - Schedule of Investment Securities (Details) - Discontinued Operations - California Medicare Advantage Business - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	$ 150,939	$ 963,062
Cash equivalents, Gross Unrealized Gains	0	32
Cash equivalents, Gross Unrealized Losses	0	0
Cash equivalents, Carrying Value	150,939	963,094
Available for sale:
Amortized Cost	22,776	1,129,025
Gross Unrealized Gains	0	568
Gross Unrealized Losses	(174)	(4,221)
Carrying Value	22,602	1,125,372
Held to maturity:
Amortized Cost	6,837	8,558
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(59)	(158)
Carrying Value	6,779	8,400
Total investments
Amortized Cost	180,552	2,100,645
Gross Unrealized Gains	1	600
Gross Unrealized Losses	(233)	(4,379)
Carrying Value	180,320	2,096,866
U.S. government and agency obligations
Available for sale:
Amortized Cost	1,557	372,244
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(100)	(3,239)
Carrying Value	1,457	369,006
Held to maturity:
Amortized Cost	6,503	6,622
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(59)	(158)
Carrying Value	6,445	6,464
Corporate obligations
Available for sale:
Amortized Cost	615	520,619
Gross Unrealized Gains	0	521
Gross Unrealized Losses	(11)	(714)
Carrying Value	604	520,426
State and municipal obligations
Available for sale:
Amortized Cost		10,308
Gross Unrealized Gains		0
Gross Unrealized Losses		(96)
Carrying Value		10,212
Certificates of deposit
Available for sale:
Amortized Cost	19,653	12,012
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Carrying Value	19,653	12,010
Held to maturity:
Amortized Cost	334	1,936
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Carrying Value	334	1,936
Mortgage-backed securities
Available for sale:
Amortized Cost	951	154,167
Gross Unrealized Gains	0	46
Gross Unrealized Losses	(63)	(156)
Carrying Value	$ 888	154,057
Asset backed securities
Available for sale:
Amortized Cost		59,289
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Carrying Value		59,289
Other
Available for sale:
Amortized Cost		386
Gross Unrealized Gains		0
Gross Unrealized Losses		(14)
Carrying Value		$ 372

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