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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
OPERATING ACTIVITIES:    
Net income $ 7,752 $ 8,757
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 19,772 18,338
Deferred income taxes 404 4,200
Share-based compensation 451 589
Gain on sale of real estate investment (273) (1,063)
Gain on sale of California Water Service Group stock (2,017) 0
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue (5,125) (11,711)
Accounts payable, purchased power and other current liabilities 489 2,266
Accrued groundwater extraction charges and purchased water 3,490 5,319
Tax receivable and accrued taxes 1,228 (144)
Other current asset and liabilities related to balancing and memorandum accounts (188) 0
Postretirement benefits 1,167 3,398
Regulatory asset related to balancing and memorandum accounts (1,107) (1,811)
Other changes, net (1,024) (1,099)
NET CASH PROVIDED BY OPERATING ACTIVITIES 25,019 27,039
INVESTING ACTIVITIES:    
Company-funded (48,155) (35,684)
Contributions in aid of construction (4,482) (4,631)
Additions to real estate investments 0 (3,453)
Payments for business/asset acquisition and water rights (807) (1,569)
Cost to retire utility plant, net of salvage (575) (1,170)
Proceeds from sale of real estate investment 4,281 8,831
Proceeds from sale of California Water Service Group stock 3,056 0
NET CASH USED IN INVESTING ACTIVITIES (46,682) (37,676)
FINANCING ACTIVITIES:    
Borrowings from line of credit 35,000 13,300
Repayments of line of credit (5,400) (28,600)
Repayments of long-term borrowings (298) (5,150)
Dividends paid (7,579) (7,086)
Issuance of common stock, net of issuance costs 0 35,894
Exercise of stock options and similar instruments 484 366
Tax benefits realized from share options exercised 309 95
Receipts of advances and contributions in aid of construction 3,941 4,348
Refunds of advances for construction (1,070) (1,047)
NET CASH PROVIDED BY FINANCING ACTIVITIES 25,387 12,120
NET CHANGE IN CASH AND CASH EQUIVALENTS 3,724 1,483
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 2,299 2,522
CASH AND CASH EQUIVALENTS, END OF PERIOD 6,023 4,005
Cash paid during the period for:    
Interest 10,551 10,487
Income taxes 1,900 1,260
Supplemental disclosure of non-cash activities:    
Increase in accrued payables for construction costs capitalized (452) 6,560
Utility property installed by developers 3,242 (112)
Increase in real estate investments due to accrued tenant improvements 11 583
Accrued intangible assets and other charges related to water supply project in Texas $ 0 $ 2,218