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INVESTMENTS (Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Investment Income [Line Items]
Gross investment income	$ 113,363	$ 107,573
Investment expenses	(6,060)	(6,574)
Net investment income	107,303	100,999
Fixed maturities
Net Investment Income [Line Items]
Gross investment income	91,382	83,958
Other investments
Net Investment Income [Line Items]
Gross investment income	6,895	13,704
Equity securities
Net Investment Income [Line Items]
Gross investment income	2,328	1,758
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	3,063	3,125
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income	5,801	4,153
Short-term investments
Net Investment Income [Line Items]
Gross investment income	$ 3,894	$ 875

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.

+ References

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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=115205541&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=114873790&loc=SL114874131-224263

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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