INCOME TAXES (Income Tax Expense Included in Income Statements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current Income Tax Expense
Federal	$ (2,000)	$ (2,000)	$ (8,000)
State	0	1,000	0
Total Current Income Tax Expense	(2,000)	(1,000)	(8,000)
Deferred Income Tax Expense
Federal	27,000	37,000	41,000
Federal Investment Tax Credits	(1,000)	(1,000)	(4,000)
State	8,000	6,000	5,000
Total Deferred Income Tax Expense	34,000	42,000	42,000
Total Income Tax Expense	$ 32,476	$ 41,452	$ 34,053