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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Cost	$ 376,493	$ 365,905
Gross unrealized gains	54,718	33,610
Gross unrealized losses	(12,348)	(17,882)
Fair value	418,863	381,633
Common stocks
Investment [Line Items]
Cost	693	790
Gross unrealized gains	207	112
Gross unrealized losses	(315)	(375)
Fair value	585	527
Exchange-traded funds
Investment [Line Items]
Cost	221,337	213,420
Gross unrealized gains	54,511	33,498
Gross unrealized losses	(4,240)	(10,079)
Fair value	271,608	236,839
Bond mutual funds
Investment [Line Items]
Cost	154,463	151,695
Gross unrealized gains	0	0
Gross unrealized losses	(7,793)	(7,428)
Fair value	$ 146,670	$ 144,267

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
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