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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
OPERATING ACTIVITIES:    
Net income $ 40,329 $ 42,459
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 79,862 71,912
Deferred income taxes 7,135 4,140
Stock-based compensation 3,991 3,201
Allowance for equity funds used during construction (1,324) (1,490)
Gain on sale of nonutility properties and Texas Water Alliance (5,532) (3,000)
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue (22,511) (19,647)
Accounts payable and other current liabilities (1,475) 3,697
Accrued groundwater extraction charges, purchased water and power 10,494 9,846
Tax receivable and payable, and other accrued taxes (1,851) 832
Postretirement benefits (2,719) 265
Regulatory assets and liabilities excluding income tax temporary differences, net and postretirement benefits 21,776 (12,418)
Up-front service concession payment (1,600) 0
Other changes, net 2,774 458
NET CASH PROVIDED BY OPERATING ACTIVITIES 129,349 100,255
INVESTING ACTIVITIES:    
Company-funded (160,515) (169,238)
Contributions in aid of construction (17,773) (12,520)
Additions to real estate investments (610) (606)
Payments to retire utility plant, net of salvage (2,432) (3,535)
Proceeds from sale of nonutility properties and Texas Water Alliance 310 3,000
Payments for business acquisitions (433) 0
NET CASH USED IN INVESTING ACTIVITIES (181,453) (182,899)
FINANCING ACTIVITIES:    
Borrowings on line of credit 152,655 67,099
Repayments on line of credit (16,481) (120,120)
Long-term borrowings 15,000 137,000
Repayments of long-term borrowings (87,757) (52,700)
Issuance of common stock, net of issuance costs 3,107 66,775
Dividends paid (32,667) (29,996)
Receipts of advances and contributions in aid of construction 21,593 23,585
Refunds of advances for construction (2,177) (2,179)
Other changes, net (98) 132
NET CASH PROVIDED BY FINANCING ACTIVITIES 53,175 89,596
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 1,071 6,952
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 12,119 9,269
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 13,190 16,221
LESS RESTRICTED CASH, END OF PERIOD 0 2,202
CASH AND CASH EQUIVALENTS, END OF PERIOD 13,190 14,019
Cash paid during the period for:    
Interest 42,473 39,533
Income taxes 572 7,643
Supplemental disclosure of non-cash activities:    
Accrued payables for additions to utility plant 22,044 26,628
Utility property installed by developers $ 976 $ 1,527