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INVESTMENTS - Equity securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	$ 421,744	$ 398,956
Gross unrealized gains	97,648	81,521
Gross unrealized losses	(947)	(6,270)
Fair value	$ 518,445	474,207
Limited Partner [Member]
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment composition	60.00%
Common shares
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	$ 10,810	504
Gross unrealized gains	689	77
Gross unrealized losses	(557)	(388)
Fair value	10,942	193
Preferred stocks
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	6,301	0
Gross unrealized gains	1,767	0
Gross unrealized losses	0	0
Fair value	8,068	0
Exchange-traded funds
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	147,794	215,986
Gross unrealized gains	74,314	81,444
Gross unrealized losses	(390)	(105)
Fair value	221,718	297,325
Bond mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	256,839	182,466
Gross unrealized gains	20,878	0
Gross unrealized losses	0	(5,777)
Fair value	$ 277,717	$ 176,689

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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
-Topic 321
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714

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