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Consolidated Statement of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating activities:      
Net income $ 73,828,000 $ 60,478,000 $ 61,515,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 106,439,000 96,474,000 91,622,000
Deferred income taxes (3,244,000) (2,851,000) (5,497,000)
Share-based compensation 4,791,000 4,246,000 3,553,000
Gain on sale of TWA, real estate investments and nonutility properties (6,197,000) (11,421,000) (948,000)
Allowance for equity funds used during construction (1,551,000) (1,926,000) (1,249,000)
Impairment of long-lived asset 0 2,211,000 0
Changes in operating assets and liabilities, net of acquired assets and liabilities:      
Accounts receivable and accrued unbilled utility revenue (8,222,000) (5,931,000) (18,918,000)
Accounts payable and other current liabilities (1,388,000) 4,843,000 (357,000)
Accrued groundwater extraction charges, purchased water and power 2,507,000 (1,984,000) 1,973,000
Tax receivable and accrued taxes (11,954,000) (6,416,000) (3,557,000)
Postretirement benefits (7,108,000) (4,312,000) (2,965,000)
Regulatory assets and liabilities excluding income tax temporary differences, net and postretirement benefits 1,714,000 (14,629,000) (14,459,000)
Up-front service concession payment (1,600,000) 0 (5,000,000)
Other noncurrent assets and noncurrent liabilities 17,923,000 13,381,000 751,000
Other changes, net 261,000 (2,123,000) (2,413,000)
Net cash provided by operating activities 166,199,000 130,040,000 104,051,000
Investing activities:      
Company-funded (218,784,000) (233,933,000) (195,323,000)
Contributions in aid of construction (22,935,000) (17,096,000) (17,096,000)
Additions to real estate investment (631,000) (826,000) (435,000)
Payments for business/asset acquisitions (433,000) (23,587,000) 0
Cost to retire utility plant, net of salvage (2,520,000) (2,781,000) (2,556,000)
Proceeds from sale of TWA, real estate investments and nonutility properties 975,000 18,228,000 1,151,000
Net cash used in investing activities (244,328,000) (259,995,000) (214,259,000)
Financing activities:      
Borrowings from lines of credit 158,779,000 96,625,000 276,174,000
Repayments of lines of credit (62,197,000) (208,722,000) (218,289,000)
Long-term borrowings 55,000,000 247,000,000 85,000,000
Long-term borrowings held as restricted cash 0 0 4,000,000
Repayments of long-term borrowings (89,177,000) (76,113,000) (28,931,000)
Dividends paid (43,582,000) (40,137,000) (36,509,000)
Receipts of advances and contributions in aid of construction 23,820,000 26,438,000 23,874,000
Refunds of advances for construction (2,859,000) (2,852,000) (2,767,000)
Issuance of common stock, net of issuance costs 39,085,000 91,028,000 0
Other changes, net (515,000) (462,000) (1,019,000)
Net cash provided by financing activities 78,354,000 132,805,000 101,533,000
Net change in cash, cash equivalents and restricted cash 225,000 2,850,000 (8,675,000)
Cash, cash equivalents and restricted cash, beginning of year 12,119,000 9,269,000 17,944,000
Cash, cash equivalents and restricted cash, end of year 12,344,000 12,119,000 9,269,000
Less restricted cash, end of year 0 1,211,000 4,000,000
Cash and cash equivalents, end of year 12,344,000 10,908,000 5,269,000
Cash paid during the year for:      
Interest 63,677,000 58,175,000 59,955,000
Income taxes 6,853,000 8,466,000 10,380,000
Supplemental disclosure of non-cash activities:      
Accrued payables for additions to utility plant 22,561,000 20,579,000 24,571,000
Utility property installed by developers $ 2,433,000 $ 2,659,000 $ 9,779,000