ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases
Operating Lease Cost (Cost resulting from lease payments)	$ 12,687	$ 12,673
Variable Lease Cost (Cost excluded from lease payments)	143	160
Total Lease Cost	12,830	12,833
Operating Lease - Operating Cash Flows (Fixed Payments)	13,243	13,023
Operating Lease - Operating Cash Flows (Liability Reduction)	$ 8,354	$ 7,752
Weighted Average Lease Term - Operating Leases	5 years 4 months 13 days	5 years 7 months 17 days
Weighted Average Discount Rate - Operating Leases	11.00%	11.00%