INVESTMENTS - Summary of Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Gross investment income	$ 444,506	$ 479,252	$ 374,271
Investment expenses	(25,677)	(24,951)	(24,670)
Net investment income	418,829	454,301	349,601
Fixed maturities
Net Investment Income [Line Items]
Gross investment income	329,858	262,049	317,121
Other investments
Net Investment Income [Line Items]
Gross investment income	57,043	181,906	16,059
Equity securities
Net Investment Income [Line Items]
Gross investment income	10,390	12,752	9,328
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	23,407	17,427	15,432
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income	20,273	4,454	13,582
Short-term investments
Net Investment Income [Line Items]
Gross investment income	$ 3,535	$ 664	$ 2,749

The net gain or loss (both realized and unrealized) related to investments in certain entities that calculate net asset value per share and the amount after accretion (amortization) of discount (premium), of interest income and dividend income on nonoperating securities.

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The net gain or loss (both realized and unrealized) related to investments in certain entities that calculate net asset value per share and the amount after accretion (amortization) of discount (premium) of interest income and dividend income on nonoperating securities, net of investment expense.

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Amount of expenses related to the generation of investment income.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
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