SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Asset Management Agreement (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Jul. 01, 2018
Accounting Policies [Abstract]
Natural Gas in Storage			$ 9,685
Intangible Asset	$ 1,300	$ 6,400	19,200
Profit Sharing - Other Liabilities	$ (3,500)	$ (7,000)	(17,546)
Total Consideration			$ 11,339