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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
OPERATING ACTIVITIES:    
Net income $ 39,112 $ 21,690
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 34,740 31,740
Deferred income taxes 16,755 4,705
Share-based compensation 1,316 1,208
Gain on sale of real estate investments (124) (1,886)
Gain on sale of California Water Service Group stock (3,197) 0
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue (19,298) (9,870)
Accounts payable and other current liabilities (3,496) 1,046
Accrued groundwater extraction charges, purchased water and power 6,534 5,260
Tax receivable and accrued taxes (6,972) 6,311
Postretirement benefits 2,838 2,526
Regulatory assets and liability related to balancing and memorandum accounts 9,239 12,068
Other changes, net (1,018) (2,454)
NET CASH PROVIDED BY OPERATING ACTIVITIES 76,429 72,344
INVESTING ACTIVITIES:    
Company-funded (102,813) (63,126)
Contributions in aid of construction (5,759) (8,400)
Additions to real estate investments (254) (570)
Payments for business/asset acquisition and water rights (1,063) (991)
Payments to retire utility plant, net of salvage (1,418) (3,146)
Proceeds from sale of real estate investments 124 1,925
Proceeds from sale of California Water Service Group stock 4,510 0
Deposit for long-lived asset held-for-sale 20,000 0
NET CASH USED IN INVESTING ACTIVITIES (86,673) (74,308)
FINANCING ACTIVITIES:    
Borrowings on line of credit 53,875 49,400
Repayments of line of credit (24,575) (41,400)
Repayments of long-term borrowings (5,143) (435)
Debt issuance costs (335) 0
Dividends paid (12,419) (11,910)
Employee stock purchase plan proceeds 954 895
Tax benefits realized from restricted and deferred stock units 203 634
Receipts of advances and contributions in aid of construction 12,032 10,516
Refunds of advances for construction (1,924) (1,864)
NET CASH PROVIDED BY FINANCING ACTIVITIES 22,668 5,836
NET CHANGE IN CASH AND CASH EQUIVALENTS 12,424 3,872
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 5,239 2,399
CASH AND CASH EQUIVALENTS, END OF PERIOD 17,663 6,271
Cash paid during the period for:    
Interest 18,324 18,218
Income taxes 18,072 3,721
Supplemental disclosure of non-cash activities:    
Increase in accrued payables for construction costs capitalized 10,349 9,225
Utility property installed by developers $ 5,063 $ 499