COMMITMENTS AND CONTINGENCIES (Other Commitments and Contingencies) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) Milestone	Dec. 31, 2020 USD ($)
Maximum
Long-term Purchase Commitment [Line Items]
Maximum repurchase collateral amount	$ 43,836	$ 56,822
Capital Addition Purchase Commitments
Long-term Purchase Commitment [Line Items]
Commitment amount	5,190	7,068
Capital Addition Purchase Commitments | Equipment [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount	791
Software License Fee Arrangement
Long-term Purchase Commitment [Line Items]
Commitment amount	$ 5,247	$ 5,266
Long-term Purchase Commitment, Milestones Completed | Milestone	1
Long-term Purchase Commitment, Milestones Remaining | Milestone	2
Commitment period	2 years