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INVESTMENTS - Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Investment Income [Line Items]
Gross investment income									$ 503,172	$ 465,806	$ 427,994
Investment expenses									(24,600)	(27,299)	(27,189)
Net investment income	$ 117,557	$ 115,763	$ 137,949	$ 107,303	$ 113,128	$ 114,421	$ 109,960	$ 100,999	478,572	438,507	400,805
Fixed maturities
Net Investment Income [Line Items]
Gross investment income									384,053	356,273	312,662
Other investments
Net Investment Income [Line Items]
Gross investment income									60,038	48,959	76,858
Equity securities
Net Investment Income [Line Items]
Gross investment income									10,434	10,077	14,919
Mortgage loans
Net Investment Income [Line Items]
Gross investment income									14,712	13,566	10,780
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income									26,882	27,566	10,057
Short-term investments
Net Investment Income [Line Items]
Gross investment income									$ 7,053	$ 9,365	$ 2,718

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=116634182&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=116637232&loc=SL114874131-224263

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