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Consolidated Statement of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities:      
Net income before noncontrolling interest $ 60,478,000 $ 61,515,000 $ 23,627,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 96,474,000 91,622,000 68,489,000
Deferred income taxes (2,851,000) (5,497,000) (1,249,000)
Share-based compensation 4,246,000 3,553,000 3,406,000
Gain on sale of TWA, real estate investments and nonutility properties (11,421,000) (948,000) (909,000)
Allowance for equity funds used during construction (1,926,000) (1,249,000) 0
Impairment of long-lived asset 2,211,000 0 0
Changes in operating assets and liabilities, net of acquired assets and liabilities:      
Accounts receivable and accrued unbilled utility revenue (5,931,000) (18,918,000) (3,860,000)
Accounts payable and other current liabilities 4,843,000 (357,000) 1,946,000
Accrued groundwater extraction charges, purchased water and power (1,984,000) 1,973,000 2,853,000
Tax receivable and accrued taxes (6,416,000) (3,557,000) (6,044,000)
Postretirement benefits (4,312,000) (2,965,000) (4,000,000)
Regulatory assets and liabilities excluding income tax temporary differences, net and postretirement benefits (14,629,000) (14,459,000) 30,838,000
Up-front service concession payment 0 (5,000,000) 0
Other noncurrent assets and noncurrent liabilities 13,381,000 751,000 7,439,000
Other changes, net (2,123,000) (2,413,000) 7,469,000
Net cash provided by operating activities 130,040,000 104,051,000 130,005,000
Investing activities:      
Company-funded (233,933,000) (195,323,000) (164,325,000)
Contributions in aid of construction (17,096,000) (17,096,000) (13,563,000)
Additions to real estate investment (826,000) (435,000) (137,000)
Payments for business/asset acquisitions (23,587,000) 0 (835,465,000)
Cost to retire utility plant, net of salvage (2,781,000) (2,556,000) (5,026,000)
Proceeds from sale of TWA, real estate investments and nonutility properties 18,228,000 1,151,000 745,000
Net cash used in investing activities (259,995,000) (214,259,000) (1,017,771,000)
Financing activities:      
Borrowings from lines of credit 96,625,000 276,174,000 105,349,000
Repayments of lines of credit (208,722,000) (218,289,000) (192,055,000)
Long-term borrowings 247,000,000 85,000,000 590,000,000
Long-term borrowings held as restricted cash 0 4,000,000 5,000,000
Repayments of long-term borrowings (76,113,000) (28,931,000) (1,400,000)
Dividends paid (40,137,000) (36,509,000) (34,134,000)
Receipts of advances and contributions in aid of construction 26,438,000 23,874,000 18,904,000
Refunds of advances for construction (2,852,000) (2,767,000) (2,911,000)
Issuance of common stock, net of issuance costs 91,028,000 0 (10,000)
Other changes, net (462,000) (1,019,000) (3,755,000)
Net cash provided by financing activities 132,805,000 101,533,000 484,988,000
Net change in cash, cash equivalents and restricted cash 2,850,000 (8,675,000) (402,778,000)
Cash, cash equivalents and restricted cash, beginning of year 9,269,000 17,944,000 420,722,000
Cash, cash equivalents and restricted cash, end of year 12,119,000 9,269,000 17,944,000
Less restricted cash, end of year 1,211,000 4,000,000 5,000,000
Cash and cash equivalents, end of year 10,908,000 5,269,000 12,944,000
Cash paid during the year for:      
Interest 58,175,000 59,955,000 32,138,000
Income taxes 8,466,000 10,380,000 16,448,000
Supplemental disclosure of non-cash activities:      
(Decrease) Increase in accrued payables for construction costs capitalized (5,436,000) 1,448,000 (516,000)
Utility property installed by developers $ 2,659,000 $ 9,779,000 $ 3,077,000