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CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Major Customers
Revenues	$ 1,328,129	$ 1,961,720	$ 2,002,857
Trade receivables	$ 104,579	$ 161,679
Revenue | Geographic Concentration Risk
Major Customers
Concentration of risk (as a percent)	3.30%	17.90%	27.80%
Revenue | Customer Concentration Risk | Customer A
Major Customers
Revenues	$ 197,379	$ 228,500	$ 219,115
Revenue | Customer Concentration Risk | Customer B
Major Customers
Revenues		213,319
Revenue | Customer Concentration Risk | Customer C
Major Customers
Revenues	157,271
Revenue | Customer Concentration Risk | Customer D
Major Customers
Revenues	137,785
Trade accounts receivable | Customer Concentration Risk | Major customers
Major Customers
Trade receivables	$ 32,000	$ 26,300

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