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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 454,451	$ 421,744
Gross unrealized gains	94,002	97,648
Gross unrealized losses	(777)	(947)
Fair value	$ 547,676	518,445
Limited partnership
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment composition	64.00%
Common stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 8,470	10,810
Gross unrealized gains	1,682	689
Gross unrealized losses	(435)	(557)
Fair value	9,717	10,942
Preferred shares
Debt and Equity Securities, FV-NI [Line Items]
Cost	5,519	6,301
Gross unrealized gains	1,430	1,767
Gross unrealized losses	0	0
Fair value	6,949	8,068
Exchange-traded funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	182,544	147,794
Gross unrealized gains	87,184	74,314
Gross unrealized losses	(342)	(390)
Fair value	269,386	221,718
Bond mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	257,918	256,839
Gross unrealized gains	3,706	20,878
Gross unrealized losses	0	0
Fair value	$ 261,624	$ 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).

+ 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=120269885&loc=SL75117546-209714

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 4
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