DERIVATIVE FINANCIAL INSTRUMENTS - Summary of Gross Asset Balances of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Liability Balances of Derivative Instruments
Total	$ (122,116)	$ (35,889)
Total, Gross amounts netted in the condensed consolidated balance sheets	0	0
Total, Net amounts presented in the condensed consolidated balance sheets	(122,116)	(35,889)
Current assets
Asset Balances of Derivative Insruments
Gross amounts recognized	365,741	382,328
Gross amounts netted in the condensed consolidated balance sheets	(359,570)	(375,601)
Net amounts presented in the condensed consolidated balance sheets	6,171	6,727
Other assets
Asset Balances of Derivative Insruments
Gross amounts recognized	106,711	150,194
Gross amounts netted in the condensed consolidated balance sheets	(104,287)	(147,624)
Net amounts presented in the condensed consolidated balance sheets	2,424	2,570
Current liabilities
Liability Balances of Derivative Instruments
Gross amounts recognized	(487,257)	(420,787)
Gross amounts netted in the condensed consolidated balance sheets	359,570	375,601
Net amounts presented in the condensed consolidated balance sheets	(127,687)	(45,186)
Long-term liabilities
Liability Balances of Derivative Instruments
Gross amounts recognized	(107,311)	(147,624)
Gross amounts netted in the condensed consolidated balance sheets	104,287	147,624
Net amounts presented in the condensed consolidated balance sheets	$ (3,024)	$ 0

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