EQUITY SECURITIES (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Gain (Loss)	$ (836,000)	$ (500,000)	$ (2,455,000)	$ (1,118,000)
Equity Securities, FV-NI, Realized Gain (Loss)	228,000	0	2,161,000	0
Equity Securities, FV-NI, Unrealized Gain (Loss)	(1,064,000)	(500,000)	(4,616,000)	(1,118,000)
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	5,000,000		5,000,000
Off-balance Sheet Obligation Threshold	2,000,000		2,000,000
Other Long-term Investments	3,900,000		3,900,000		$ 3,900,000
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount	6,200,000		6,200,000
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount	958,000		958,000
Equity Securities without Readily Determinable Fair Value, Impairment Loss And Downward Adjustments	0	$ 0	0	$ (2,958,000)
Marketable Securities and Equity Securities, FV-NI	2,600,000		2,600,000		11,100,000
Equity Method Investments	$ 46,100,000		$ 46,100,000		$ 37,300,000