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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Cost	$ 376,007	$ 552,867
Gross Unrealized Gains	64,888	84,527
Gross Unrealized Losses	(7,584)	(1,883)
Fair Value	433,311	635,511
Common stocks
Investment [Line Items]
Cost	13,392	22,836
Gross Unrealized Gains	1,345	3,412
Gross Unrealized Losses	(1,232)	(590)
Fair Value	13,505	25,658
Exchange-traded funds
Investment [Line Items]
Cost	211,940	356,252
Gross Unrealized Gains	63,543	71,675
Gross Unrealized Losses	(2,035)	(294)
Fair Value	273,448	427,633
Bond mutual funds
Investment [Line Items]
Cost	150,675	173,779
Gross Unrealized Gains	0	9,440
Gross Unrealized Losses	(4,317)	(999)
Fair Value	$ 146,358	$ 182,220

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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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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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