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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
OPERATING ACTIVITIES:    
Net income $ 42,459 $ 48,231
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 71,912 68,683
Deferred income taxes 4,140 (6,358)
Stock-based compensation 3,201 2,318
Allowance for equity funds used during construction (1,490) 0
Gain on sale of Texas Water Alliance and real estate investments (3,000) (1,050)
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue (19,647) (34,491)
Accounts payable and other current liabilities 3,697 (3,877)
Accrued groundwater extraction charges, purchased water and power 9,846 10,396
Tax receivable and payable, and other accrued taxes 832 6,459
Postretirement benefits 265 408
Regulatory assets and liabilities excluding income tax temporary differences, net and postretirement benefits (12,418) (14,086)
Up-front service concession payment 0 (5,000)
Other changes, net 458 (1,018)
NET CASH PROVIDED BY OPERATING ACTIVITIES 100,255 70,615
INVESTING ACTIVITIES:    
Company-funded (169,238) (130,426)
Contributions in aid of construction (12,520) (9,584)
Additions to real estate investments (606) (391)
Payments to retire utility plant, net of salvage (3,535) (1,877)
Proceeds from sale of Texas Water Alliance and real estate investments 3,000 1,068
NET CASH USED IN INVESTING ACTIVITIES (182,899) (141,210)
FINANCING ACTIVITIES:    
Borrowings on line of credit 67,099 226,884
Repayments on line of credit (120,120) (218,290)
Long-term borrowings 137,000 85,000
Repayments of long-term borrowings (52,700) (9,589)
Issuance of common stock, net of issuance costs 66,775 0
Debt issuance costs (843) (646)
Dividends paid (29,996) (27,371)
Receipts of advances and contributions in aid of construction 23,585 19,059
Refunds of advances for construction (2,179) (2,121)
Other changes, net 975 (64)
NET CASH PROVIDED BY FINANCING ACTIVITIES 89,596 72,862
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 6,952 2,267
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 9,269 17,944
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 16,221 20,211
LESS RESTRICTED CASH, END OF PERIOD 2,202 0
CASH AND CASH EQUIVALENTS, END OF PERIOD 14,019 20,211
Cash paid during the period for:    
Interest 39,533 40,409
Income taxes 7,643 7,024
Supplemental disclosure of non-cash activities:    
Accrued payables for additions to utility plant 26,628 21,857
Change in accrued payables for construction costs capitalized (209) 1,997
Utility property installed by developers $ 1,527 $ 5,051