REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 252,000	$ 310,000
Alternative Revenues	14,000	12,000
Other	13,000	11,000
Total Operating Revenues	278,556	333,003
Retail
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	192,000	202,000
Wholesale
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	36,000	84,000
Other Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 24,000	$ 24,000