DISCONTINUED OPERATIONS - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	$ 382,510	$ 340,795
Cash equivalents, Gross Unrealized Gains	5	8
Cash equivalents, Gross Unrealized Losses	(9)	0
Cash equivalents, Carrying Value	382,506	340,803
Available for sale:
Amortized Cost	14,033	16,390
Gross Unrealized Gains	5	1
Gross Unrealized Losses	(292)	(413)
Carrying Value	13,746	15,978
Held to maturity:
Amortized Cost	2,182	2,632
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Carrying Value	2,182	2,632
Available for sale and held to maturity
Amortized Cost, Total investments	398,725	359,817
Gross Unrealized Gains, Total investments	10	9
Gross Unrealized Losses, Total investments	(301)	(413)
Carrying Value, Total investments	398,434	359,413
Bright Healthcare – Commercial Segment \| Discontinued Operations
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	928,290	622,267
Cash equivalents, Gross Unrealized Gains	30	24
Cash equivalents, Gross Unrealized Losses	(60)	0
Cash equivalents, Carrying Value	928,260	622,291
Available for sale:
Amortized Cost	438,669	1,118,358
Gross Unrealized Gains	1,180	570
Gross Unrealized Losses	(2,503)	(3,832)
Carrying Value	437,346	1,115,096
Held to maturity:
Amortized Cost	4,823	5,974
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(110)	(159)
Carrying Value	4,713	5,815
Available for sale and held to maturity
Amortized Cost, Total investments	1,371,782	1,746,599
Gross Unrealized Gains, Total investments	1,210	594
Gross Unrealized Losses, Total investments	(2,673)	(3,991)
Carrying Value, Total investments	1,370,319	1,743,202
U.S. government and agency obligations
Available for sale:
Amortized Cost	7,256	8,742
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(210)	(301)
Carrying Value	7,047	8,441
Held to maturity:
Amortized Cost	233	685
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Carrying Value	233	685
U.S. government and agency obligations \| Bright Healthcare – Commercial Segment \| Discontinued Operations
Available for sale:
Amortized Cost	277,194	365,040
Gross Unrealized Gains	142	1
Gross Unrealized Losses	(1,535)	(2,956)
Carrying Value	275,801	362,085
Held to maturity:
Amortized Cost	4,823	5,974
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(110)	(159)
Carrying Value	4,713	5,815
Corporate obligations
Available for sale:
Amortized Cost	2,906	3,401
Gross Unrealized Gains	4	1
Gross Unrealized Losses	(69)	(95)
Carrying Value	2,841	3,307
Corporate obligations \| Bright Healthcare – Commercial Segment \| Discontinued Operations
Available for sale:
Amortized Cost	124,158	520,097
Gross Unrealized Gains	942	523
Gross Unrealized Losses	(643)	(623)
Carrying Value	124,457	519,997
State and municipal obligations
Available for sale:
Amortized Cost	458	712
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(12)	(17)
Carrying Value	446	695
State and municipal obligations \| Bright Healthcare – Commercial Segment \| Discontinued Operations
Available for sale:
Amortized Cost	7,614	9,653
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(57)	(80)
Carrying Value	7,558	9,573
Certificates of deposit
Available for sale:
Amortized Cost	3,304	3,318
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Carrying Value	3,304	3,318
Held to maturity:
Amortized Cost	1,949	1,947
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Carrying Value	1,949	1,947
Certificates of deposit \| Bright Healthcare – Commercial Segment \| Discontinued Operations
Available for sale:
Amortized Cost	1,837	8,760
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Carrying Value	1,837	8,758
Mortgage-backed securities
Available for sale:
Amortized Cost	37	156
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Carrying Value	36	156
Mortgage-backed securities \| Bright Healthcare – Commercial Segment \| Discontinued Operations
Available for sale:
Amortized Cost	9,153	154,864
Gross Unrealized Gains	6	46
Gross Unrealized Losses	(213)	(157)
Carrying Value	8,946	154,753
Asset backed securities
Available for sale:
Amortized Cost	72	60
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Carrying Value	72	60
Asset backed securities \| Bright Healthcare – Commercial Segment \| Discontinued Operations
Available for sale:
Amortized Cost	18,325	59,557
Gross Unrealized Gains	89	0
Gross Unrealized Losses	(46)	0
Carrying Value	18,368	59,557
Other
Available for sale:
Amortized Cost		1
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Carrying Value		1
Other \| Bright Healthcare – Commercial Segment \| Discontinued Operations
Available for sale:
Amortized Cost	388	387
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(9)	(14)
Carrying Value	$ 379	$ 373

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