BASIS OF PRESENTATION AND SIGNIFICANT ACCCOUNTING POLICIES (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Trade receivables	$ 14,077,000	$ 18,048,000
Debt securities, available-for-sale	220,206,000	336,088,000
Available-for-sale debt securities, allowance for credit losses	$ 0	$ 0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member