FUEL DERIVATIVES AND RISK MANAGEMENT - Fuel Derivative Gains (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Fuel Derivative Gains (Losses)
Total Fuel Derivative Gains	$ 0	$ 2,386
Fuel Derivative Contracts
Fuel Derivative Gains (Losses)
Non-cash Gains	0	2,386
Cash Premiums Paid	$ 0	$ 0

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

Name:	us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration