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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
REVENUE $ 114,785 $ 115,754
Production Expenses:    
Purchased water 15,645 15,934
Power 3,003 2,725
Groundwater extraction charges 15,545 15,028
Other production expenses 9,402 10,093
Total production expenses 43,595 43,780
Administrative and general 20,893 21,262
Maintenance 6,265 6,086
Property taxes and other non-income taxes 7,515 7,463
Depreciation and amortization 23,438 21,382
Merger related expenses 0 354
Total operating expense 101,706 100,327
OPERATING INCOME 13,079 15,427
OTHER (EXPENSE) INCOME:    
Interest on long-term debt and other interest expense (13,439) (13,284)
Pension non-service cost 326 (45)
Other, net 1,754 757
Income before income taxes 1,720 2,855
(Benefit) provision for income taxes (896) 438
NET INCOME 2,616 2,417
Other comprehensive income (loss), net 38 (135)
COMPREHENSIVE INCOME $ 2,654 $ 2,282
EARNINGS PER SHARE    
Basic (usd per share) $ 0.09 $ 0.08
Diluted (usd per share) 0.09 0.08
DIVIDENDS PER SHARE (usd per share) $ 0.34 $ 0.32
WEIGHTED AVERAGE SHARES OUTSTANDING    
Basic (shares) 28,862,882 28,489,357
Diluted (shares) 28,990,203 28,674,221