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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
OPERATING ACTIVITIES:    
Net income $ 23,391 $ 22,138
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 48,406 45,608
Deferred income taxes 903 (977)
Stock-based compensation 2,071 1,260
Allowance for equity funds used during construction (916) 0
Gain on sale of Texas Water Alliance (3,000) 0
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue (7,812) (23,081)
Accounts payable and other current liabilities 553 (9,012)
Accrued groundwater extraction charges, purchased water and power 7,106 9,403
Tax receivable and payable, and other accrued taxes 2,647 5,734
Postretirement benefits 1,955 4,295
Regulatory assets and liabilities excluding income tax temporary differences, net and postretirement benefits. (8,231) (13,903)
Up-front service concession payment 0 (5,000)
Other changes, net 23 (4,125)
NET CASH PROVIDED BY OPERATING ACTIVITIES 67,096 32,340
INVESTING ACTIVITIES:    
Company-funded (100,057) (74,081)
Contributions in aid of construction (7,357) (5,044)
Additions to real estate investments (230) (324)
Payments to retire utility plant, net of salvage (909) (1,649)
Proceeds from sale of Texas Water Alliance 3,000 0
Payment for asset acquisition (1,452) 0
NET CASH USED IN INVESTING ACTIVITIES (107,005) (81,098)
FINANCING ACTIVITIES:    
Borrowings on line of credit 45,669 89,196
Repayments on line of credit (82,222) (59,734)
Long-term borrowings 87,000 35,000
Repayments of long-term borrowings (51,617) (1,706)
Issuance of common stock, net of issuance costs 66,775 0
Debt issuance costs (296) (214)
Dividends paid (19,857) (18,240)
Receipts of advances and contributions in aid of construction 14,673 11,064
Refunds of advances for construction (1,363) (1,326)
Other changes, net (21) 91
NET CASH PROVIDED BY FINANCING ACTIVITIES 58,741 54,131
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 18,832 5,373
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 9,269 17,944
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 28,101 23,317
LESS RESTRICTED CASH, END OF PERIOD 2,659 0
CASH AND CASH EQUIVALENTS, END OF PERIOD 25,442 23,317
Cash paid during the period for:    
Interest 29,266 30,030
Income taxes 1,020 5
Supplemental disclosure of non-cash activities:    
Accrued payables for additions to utility plant 29,123 18,006
Change in accrued payables for construction costs capitalized 3,391 (4,166)
Utility property installed by developers $ 1,230 $ 3,154