SEGMENTS OF BUSINESS - Assets And Capital Expenditure (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
SEGMENTS OF BUSINESS
Assets	$ 366,097	$ 585,420	$ 369,120
Capital Expenditures	11,693	14,874
Operating Segment | Electric Operations
SEGMENTS OF BUSINESS
Assets	222,865	211,116
Capital Expenditures	5,449	6,242
Operating Segment | Coal Operations
SEGMENTS OF BUSINESS
Assets	141,023	370,292
Capital Expenditures	6,244	8,632
Corporate and Other and Eliminations
SEGMENTS OF BUSINESS
Assets	$ 2,209	$ 4,012