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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
OPERATING ACTIVITIES:    
Net income before noncontrolling interest $ 43,795 $ 39,112
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 37,877 34,740
Deferred income taxes 1,283 16,755
Share-based compensation 1,633 1,316
Gain on sale of real estate investments (6,903) (124)
Gain on sale of California Water Service Group stock 0 (3,197)
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue (18,335) (19,298)
Accounts payable and other current liabilities 2,215 (3,496)
Accrued groundwater extraction charges, purchased water and power 10,850 6,534
Tax payable and receivable, and other accrued taxes 14,228 (6,972)
Postretirement benefits 3,355 2,838
Regulatory assets and liability related to balancing and memorandum accounts (503) 9,239
Other changes, net (1,528) (518)
NET CASH PROVIDED BY OPERATING ACTIVITIES 87,967 76,929
INVESTING ACTIVITIES:    
Company-funded (103,417) (102,813)
Contributions in aid of construction (2,631) (5,759)
Additions to real estate investments (116) (254)
Payments for business/asset acquisition and water rights (1,149) (1,063)
Payments to retire utility plant, net of salvage (2,323) (1,418)
Proceeds from sale of real estate investments 11,180 124
Proceeds from non-refundable deposit 3,000 0
Proceeds from sale of California Water Service Group stock 0 4,510
Deposit for long-lived asset held-for-sale 0 20,000
NET CASH USED IN INVESTING ACTIVITIES (95,456) (86,673)
FINANCING ACTIVITIES:    
Borrowings on line of credit 28,500 53,875
Repayments of line of credit (29,700) (24,575)
Repayments of long-term borrowings (2,717) (5,143)
Payment to noncontrolling interest (1,896) 0
Dividends paid (13,380) (12,419)
Receipts of advances and contributions in aid of construction 10,486 12,032
Refunds of advances for construction (1,982) (1,924)
Other changes, net 397 322
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES (10,292) 22,168
NET CHANGE IN CASH AND CASH EQUIVALENTS (17,781) 12,424
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 25,350 5,239
CASH AND CASH EQUIVALENTS, END OF PERIOD 7,569 17,663
Cash paid during the period for:    
Interest 18,383 18,324
Income taxes 14,552 18,072
Supplemental disclosure of non-cash activities:    
Increase in accrued payables for construction costs capitalized 11,241 10,349
Utility property installed by developers $ 874 $ 5,063