REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue receivables (Note 3)	$ 13,717	$ 11,378
Accounts receivable	2,249	1,033
Gas Processing Agreement
Disaggregation of Revenue [Line Items]
Operations and maintenance expenses	5,400	3,000
Product sales	5,700	3,700
Product, Excess Recovery Volumnes
Disaggregation of Revenue [Line Items]
Revenue, affiliate	9,800
Operations and maintenance expenses	2,400
Costs of product sales — affiliate	9,800
Product sales	2,400
Other
Disaggregation of Revenue [Line Items]
Revenue, affiliate	$ 1,663	$ 937	$ 0