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OTHER INCOME AND EXPENSES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other income and expenses      
Revenue from contracts with customers $ 790,334 $ 772,616 $ 765,704
Loss (gain) from non-qualified benefit plan investments (4,919) 7,161 (3,800)
Nonoperating expense 11,807 24,821 17,234
Revenue 18,509 21,276 22,761
Expense 11,807 24,821 17,234
Insurance Programs      
Other income and expenses      
Revenue from contracts with customers   2,700  
Operating and maintenance revenue      
Other income and expenses      
Revenue from contracts with customers 12,499 12,860 16,276
Expense from contract with customer 10,786 11,959 16,344
Leases      
Other income and expenses      
Lease revenue 2,504 2,642 2,744
Lease expense 26 46 230
Design and construction      
Other income and expenses      
Revenue from contracts with customers 652 416 619
Expense from contract with customer 536 328 611
Meter reading and billing      
Other income and expenses      
Revenue from contracts with customers 198 534 495
Expense from contract with customer 2 123 79
Interest income      
Other income and expenses      
Interest income 303 177 171
Other non-regulated income and expenses      
Other income and expenses      
Nonoperating income 2,353 4,647 2,456
Nonoperating expense $ 5,376 $ 5,204 $ 3,770