SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Asset Management Agreement (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jul. 01, 2018
Accounting Policies [Abstract]
Natural Gas in Storage			$ 9,685
Intangible Asset	$ 10,200	$ 11,500	19,200
Profit Sharing - Other Liabilities	$ (10,300)	$ (10,600)	(17,546)
Total Consideration			$ 11,339