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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
OPERATING ACTIVITIES:    
Net income $ 3,378 $ 4,695
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,597 10,558
Deferred income taxes 999 460
Share-based compensation 473 399
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue 3,724 (410)
Accounts payable and other current liabilities (1,704) 167
Accrued groundwater extraction charges, purchased water and power (1,392) 697
Tax receivable and accrued taxes 10,049 9,011
Postretirement benefits 2,169 2,289
Regulatory assets and liability related to balancing and memorandum accounts 3,021 1,418
Other changes, net (227) (2,117)
NET CASH PROVIDED BY OPERATING ACTIVITIES 32,087 27,167
INVESTING ACTIVITIES:    
Company-funded (31,560) (16,253)
Contributions in aid of construction (1,470) (1,847)
Additions to real estate investments 0 (59)
Payments for business/asset acquisition and water rights (1,061) (991)
Payments to retire utility plant, net of salvage (395) (2,318)
NET CASH USED IN INVESTING ACTIVITIES (34,486) (21,468)
FINANCING ACTIVITIES:    
Borrowings from line of credit 14,950 16,700
Repayments of line of credit (10,050) (18,200)
Repayments of long-term borrowings (152) (147)
Dividends paid (4,135) (3,966)
Employee stock purchase plan proceeds 451 433
Tax benefits realized from restricted and deferred stock units 108 526
Receipts of advances and contributions in aid of construction 5,155 2,416
Refunds of advances for construction (475) (443)
NET CASH PROVIDED (USED) BY FINANCING ACTIVITIES 5,852 (2,681)
NET CHANGE IN CASH AND CASH EQUIVALENTS 3,453 3,018
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 5,239 2,399
CASH AND CASH EQUIVALENTS, END OF PERIOD 8,692 5,417
Cash paid (received) during the period for:    
Interest 6,370 6,474
Income taxes (7,950) (6,000)
Supplemental disclosure of non-cash activities:    
Increase in accrued payables for construction costs capitalized 3,975 4,408
Utility property installed by developers $ 3,797 $ (35)