SEGMENTS OF BUSINESS - Assets And Capital Expenditure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
SEGMENTS OF BUSINESS
Assets	$ 369,120	$ 589,780
Capital Expenditures	53,367	75,352
Operating Segment | Electric Operations
SEGMENTS OF BUSINESS
Assets	220,477	208,331
Capital Expenditures	18,699	18,831
Operating Segment | Coal Operations
SEGMENTS OF BUSINESS
Assets	144,519	376,387
Capital Expenditures	34,081	56,521
Corporate and Other and Eliminations
SEGMENTS OF BUSINESS
Assets	4,124	$ 5,062
Capital Expenditures	$ 587