BASIS OF PRESENTATION AND SIGNIFICANT ACCCOUNTING POLICIES (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Trade receivables	$ 15,025,000	$ 18,048,000
Debt securities, available-for-sale	255,786,000	336,088,000
Available-for-sale debt securities, allowance for credit losses	$ 0	$ 0