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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
REVENUE $ 137,296 $ 124,302
Production Expenses:    
Purchased water 22,418 19,217
Power 2,199 3,080
Groundwater extraction charges 10,359 13,928
Other production expenses 12,043 10,123
Total production expenses 47,019 46,348
Administrative and general 24,344 24,205
Maintenance 6,058 6,695
Property taxes and other non-income taxes 8,401 8,309
Depreciation and amortization 26,296 27,606
Gain on sale of nonutility properties 0 (5,450)
Total operating expense 112,118 107,713
OPERATING INCOME 25,178 16,589
OTHER (EXPENSE) INCOME:    
Interest on long-term debt and other interest expense (15,772) (13,729)
Pension non-service cost (64) 949
Other, net 3,266 995
Income before income taxes 12,608 4,804
Provision for income taxes 1,078 1,067
NET INCOME 11,530 3,737
Other comprehensive income (loss), net 93 (181)
COMPREHENSIVE INCOME $ 11,623 $ 3,556
EARNINGS PER SHARE    
Basic (usd per share) $ 0.37 $ 0.12
Diluted (usd per share) 0.37 0.12
DIVIDENDS PER SHARE (usd per share) $ 0.38 $ 0.36
WEIGHTED AVERAGE SHARES OUTSTANDING    
Basic (shares) 30,936,476 30,224,135
Diluted (shares) 31,040,897 30,335,974