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INVESTMENTS (Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Investment Income [Line Items]
Gross investment income	$ 107,573	$ 105,857
Investment expenses	(6,574)	(7,193)
Net investment income	100,999	98,664
Fixed maturities
Net Investment Income [Line Items]
Gross investment income	83,958	77,407
Other investments
Net Investment Income [Line Items]
Gross investment income	13,704	18,962
Equity securities
Net Investment Income [Line Items]
Gross investment income	1,758	3,478
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	3,125	2,477
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income	4,153	3,095
Short-term investments
Net Investment Income [Line Items]
Gross investment income	$ 875	$ 438

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.

+ References

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- Definition

Amount of expenses related to the generation of investment income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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