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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 510,891	$ 421,744
Gross unrealized gains	109,534	97,648
Gross unrealized losses	(1,603)	(947)
Fair value	$ 618,822	518,445
Limited partnership
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment composition (as a percent)	72.00%
Common stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 943	10,810
Gross unrealized gains	493	689
Gross unrealized losses	(409)	(557)
Fair value	1,027	10,942
Preferred shares
Debt and Equity Securities, FV-NI [Line Items]
Cost	115	6,301
Gross unrealized gains	148	1,767
Gross unrealized losses	0	0
Fair value	263	8,068
Exchange-traded funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	203,336	147,794
Gross unrealized gains	107,163	74,314
Gross unrealized losses	(659)	(390)
Fair value	309,840	221,718
Bond mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	306,497	256,839
Gross unrealized gains	1,730	20,878
Gross unrealized losses	(535)	0
Fair value	$ 307,692	$ 277,717

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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), classified as current.

+ 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=123594786&loc=SL75136599-209740

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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=123583765&loc=SL75117546-209714

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