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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
OPERATING ACTIVITIES:    
Net income $ 46,118 $ 17,707
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 29,635 27,510
Deferred income taxes 18,488 10,211
Share-based compensation 774 786
Gain on sale of real estate investment (554) (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 (8,638) (13,067)
Accounts payable, purchased power and other current liabilities 1,047 (1,948)
Accrued groundwater extraction charges and purchased water 3,278 6,109
Tax receivable and accrued taxes 1,428 2,517
Postretirement benefits 833 4,312
Regulatory asset related to balancing and memorandum accounts (43,331) (3,536)
Other changes, net (1,160) (2,326)
NET CASH PROVIDED BY OPERATING ACTIVITIES 45,901 47,212
INVESTING ACTIVITIES:    
Company-funded (70,255) (59,503)
Contributions in aid of construction (7,311) (8,280)
Additions to real estate investments (9) (4,177)
Payments for business/asset acquisition and water rights (1,584) (1,587)
Cost to retire utility plant, net of salvage (874) (1,814)
Proceeds from sale of real estate investment 4,572 8,831
Proceeds from sale of California Water Service Group stock 3,056 0
NET CASH USED IN INVESTING ACTIVITIES (72,405) (66,530)
FINANCING ACTIVITIES:    
Borrowings from line of credit 51,200 25,200
Repayments of line of credit (65,400) (33,500)
Long-term borrowings 50,000 0
Repayments of long-term borrowings (413) (5,258)
Dividends paid (11,373) (10,764)
Issuance of common stock, net of issuance costs 0 35,894
Exercise of stock options and similar instruments 917 878
Tax benefits realized from share options exercised 306 27
Receipts of advances and contributions in aid of construction 6,601 9,233
Refunds of advances for construction (2,034) (1,695)
NET CASH PROVIDED BY FINANCING ACTIVITIES 29,804 20,015
NET CHANGE IN CASH AND CASH EQUIVALENTS 3,300 697
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 2,299 2,522
CASH AND CASH EQUIVALENTS, END OF PERIOD 5,599 3,219
Cash paid during the period for:    
Interest 15,651 15,478
Income taxes 1,930 2,185
Supplemental disclosure of non-cash activities:    
(Decrease) increase in accrued payables for construction costs capitalized (296) 4,141
Utility property installed by developers 3,242 190
Increase in real estate investments due to accrued tenant improvements 0 379
Accrued intangible assets and other charges related to water supply project in Texas $ 0 $ 2,209