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INVESTMENTS - Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Investment Income [Line Items]
Gross investment income									$ 374,271	$ 503,172	$ 465,806
Investment expenses									(24,670)	(24,600)	(27,299)
Net investment income	$ 109,503	$ 101,956	$ 45,040	$ 93,101	$ 117,557	$ 115,763	$ 137,949	$ 107,303	349,601	478,572	438,507
Fixed maturities
Net Investment Income [Line Items]
Gross investment income									317,121	384,053	356,273
Other investments
Net Investment Income [Line Items]
Gross investment income									16,059	60,038	48,959
Equity securities
Net Investment Income [Line Items]
Gross investment income									9,328	10,434	10,077
Mortgage loans
Net Investment Income [Line Items]
Gross investment income									15,432	14,712	13,566
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income									13,582	26,882	27,566
Short-term investments
Net Investment Income [Line Items]
Gross investment income									$ 2,749	$ 7,053	$ 9,365

X

- Definition

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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- Definition

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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- Definition

Amount of expenses related to the generation of investment income.

+ References

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 http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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