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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Cost	$ 366,415	$ 552,867
Gross Unrealized Gains	54,560	84,527
Gross Unrealized Losses	(3,763)	(1,883)
Fair Value	417,212	635,511
Common stocks
Investment [Line Items]
Cost	13,302	22,836
Gross Unrealized Gains	1,239	3,412
Gross Unrealized Losses	(1,114)	(590)
Fair Value	13,427	25,658
Exchange-traded funds
Investment [Line Items]
Cost	211,940	356,252
Gross Unrealized Gains	53,318	71,675
Gross Unrealized Losses	(1,413)	(294)
Fair Value	263,845	427,633
Bond mutual funds
Investment [Line Items]
Cost	141,173	173,779
Gross Unrealized Gains	3	9,440
Gross Unrealized Losses	(1,236)	(999)
Fair Value	$ 139,940	$ 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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- 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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