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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES:    
Net income $ 3,671 $ 3,378
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,646 11,597
Deferred income taxes 1,595 999
Share-based compensation 586 473
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue 6,015 3,724
Accounts payable and other current liabilities 557 (1,704)
Accrued groundwater extraction charges, purchased water and power (454) (1,392)
Tax receivable and accrued taxes 1,090 10,049
Postretirement benefits 1,915 2,169
Regulatory assets and liability related to balancing and memorandum accounts 1,917 3,021
Other changes, net (1,296) 259
NET CASH PROVIDED BY OPERATING ACTIVITIES 28,242 32,573
INVESTING ACTIVITIES:    
Company-funded (27,745) (31,560)
Contributions in aid of construction (1,646) (1,470)
Additions to real estate investments (62) 0
Payments for business/asset acquisition and water rights (1,101) (1,061)
Payments to retire utility plant, net of salvage (397) (395)
NET CASH USED IN INVESTING ACTIVITIES (30,951) (34,486)
FINANCING ACTIVITIES:    
Borrowings on line of credit 0 14,950
Repayments of line of credit (14,200) (10,050)
Repayments of long-term borrowings (32) (152)
Dividends paid (4,456) (4,135)
Employee stock purchase plan proceeds 570 451
Taxes paid related to net share settlement of restricted and deferred stock units (815) (486)
Tax benefits realized from restricted and deferred stock units 0 108
Receipts of advances and contributions in aid of construction 3,924 5,155
Refunds of advances for construction (532) (475)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES (15,541) 5,366
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (18,250) 3,453
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 25,350 5,239
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 7,100 8,692
Cash paid (received) during the period for:    
Interest 6,044 6,370
Income taxes 0 (7,950)
Supplemental disclosure of non-cash activities:    
Increase in accrued payables for construction costs capitalized 1,634 3,975
Utility property installed by developers 243 3,797
RECONCILIATION TO CONSOLIDATED BALANCE SHEETS:    
Cash and cash equivalents 7,092 8,692
Restricted cash $ 8 $ 0