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Consolidated Statement of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating activities:      
Net income $ 84,987,000 $ 73,828,000 $ 60,478,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 108,138,000 106,439,000 96,474,000
Deferred income taxes (8,510,000) (3,244,000) (2,851,000)
Stock-based compensation 4,647,000 4,791,000 4,246,000
Allowance for equity funds used during construction (2,114,000) (1,551,000) (1,926,000)
Impairment of long-lived asset 0 0 2,211,000
Gain on sale of nonutility properties and other assets 0 (6,197,000) (11,421,000)
Changes in operating assets and liabilities, net of acquired assets and liabilities:      
Accounts receivable and accrued unbilled revenue (10,869,000) (8,222,000) (5,931,000)
Accounts payable and other current liabilities 492,000 (1,388,000) 4,843,000
Accrued groundwater extraction charges, purchased water and power 4,772,000 2,507,000 (1,984,000)
Tax receivable and payable, and other accrued taxes (22,415,000) (11,954,000) (6,416,000)
Postretirement benefits (1,549,000) (7,108,000) (4,312,000)
Regulatory assets and liabilities excluding income tax temporary differences and postretirement benefits 12,278,000 1,714,000 (14,629,000)
Other noncurrent assets and liabilities 20,756,000 17,923,000 13,381,000
Other changes, net 218,000 (1,339,000) (2,123,000)
Net cash provided by operating activities 190,831,000 166,199,000 130,040,000
Investing activities:      
Company-funded (271,772,000) (218,784,000) (233,933,000)
Contributions in aid of construction (16,855,000) (22,935,000) (17,096,000)
Additions to nonutility assets and real estate investments (24,244,000) (631,000) (826,000)
Payments for business acquisitions (7,537,000) (433,000) (23,587,000)
Cost to retire utility plant, net of salvage (2,097,000) (2,520,000) (2,781,000)
Proceeds from sale of assets 0 975,000 18,228,000
Other changes, net 233,000 0 0
Net cash used in investing activities (322,272,000) (244,328,000) (259,995,000)
Financing activities:      
Borrowings from lines of credit 146,415,000 158,779,000 96,625,000
Repayments of lines of credit (134,493,000) (62,197,000) (208,722,000)
Long-term borrowings 70,000,000 55,000,000 247,000,000
Repayments of long-term borrowings (4,347,000) (89,177,000) (76,113,000)
Dividends paid (47,905,000) (43,582,000) (40,137,000)
Receipts of advances and contributions in aid of construction 22,425,000 23,820,000 26,438,000
Refunds of advances for construction (2,763,000) (2,859,000) (2,852,000)
Issuance of common stock, net of issuance costs 80,659,000 39,085,000 91,028,000
Other changes, net (1,171,000) (515,000) (462,000)
Net cash provided by financing activities 128,820,000 78,354,000 132,805,000
Net change in cash, cash equivalents and restricted cash (2,621,000) 225,000 2,850,000
Cash, cash equivalents and restricted cash, beginning of year 12,344,000 12,119,000 9,269,000
Cash, cash equivalents and restricted cash, end of year 9,723,000 12,344,000 12,119,000
Less restricted cash, end of year 0 0 1,211,000
Cash and cash equivalents, end of year 9,723,000 12,344,000 10,908,000
Cash paid during the year for:      
Interest 67,508,000 63,677,000 58,175,000
Income taxes 23,020,000 6,853,000 8,466,000
Supplemental disclosure of non-cash activities:      
Accrued payables for additions to utility plant 35,904,000 22,561,000 20,579,000
Utility property installed by developers 3,341,000 2,433,000 2,659,000
Seller financing in asset acquisition, net of discount $ 15,400,000 $ 0 $ 0