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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
OPERATING ACTIVITIES:    
Net income $ 12,156 $ 7,752
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 21,152 19,772
Deferred income taxes 2,170 404
Share-based compensation 761 451
Gain on sale of real estate investment 0 (273)
Gain on sale of California Water Service Group stock 0 (2,017)
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue (3,340) (5,125)
Accounts payable and other current liabilities 92 (138)
Accrued groundwater extraction charges and purchased water 2,641 3,490
Purchased power (72) 627
Tax receivable and accrued taxes 4,741 1,228
Other current asset and liabilities related to balancing and memorandum accounts (102) (188)
Postretirement benefits 2,641 1,167
Regulatory asset related to balancing and memorandum accounts 4,292 (1,107)
Other changes, net (2,114) (1,024)
NET CASH PROVIDED BY OPERATING ACTIVITIES 45,018 25,019
INVESTING ACTIVITIES:    
Company-funded (37,897) (48,155)
Contributions in aid of construction (6,151) (4,482)
Additions to real estate investments (99) 0
Payments for business/asset acquisition and water rights (991) (807)
Cost to retire utility plant, net of salvage (2,532) (575)
Proceeds from sale of real estate investment 0 4,281
Proceeds from sale of California Water Service Group stock 0 3,056
NET CASH USED IN INVESTING ACTIVITIES (47,670) (46,682)
FINANCING ACTIVITIES:    
Borrowings from line of credit 41,900 35,000
Repayments of line of credit (34,900) (5,400)
Repayments of long-term borrowings (314) (298)
Dividends paid (7,936) (7,579)
Exercise of stock options and similar instruments 433 484
Tax benefits realized from share options exercised 634 309
Receipts of advances and contributions in aid of construction 6,797 3,941
Refunds of advances for construction (1,123) (1,070)
NET CASH PROVIDED BY FINANCING ACTIVITIES 5,491 25,387
NET CHANGE IN CASH AND CASH EQUIVALENTS 2,839 3,724
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 2,399 2,299
CASH AND CASH EQUIVALENTS, END OF PERIOD 5,238 6,023
Cash paid (received) during the period for:    
Interest 11,905 10,551
Income taxes (448) 1,900
Supplemental disclosure of non-cash activities:    
Increase (decrease) in accrued payables for construction costs capitalized 5,842 (452)
Utility property installed by developers $ 460 $ 3,242