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Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating activities:      
Net income $ 22,318 $ 20,878 $ 24,406
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 34,629 32,709 29,756
Deferred income taxes 12,235 16,458 8,077
Share-based compensation 564 651 812
Gain on sale of California Water Service Group stock 0 0 (18,966)
Impairment on real estate investment 0 0 3,597
Gain on sale of real estate investment (910) 0 0
Loss on sale of utility property 0 23 0
Changes in operating assets and liabilities:      
Accounts receivable and accrued unbilled utility revenue (800) (2,470) (2,197)
Accounts payable, purchased power and other current liabilities 933 (133) 887
Accrued groundwater extraction charges and purchased water (1,034) 1,430 (137)
Tax receivable and accrued taxes 5,093 (1,102) (8,528)
Other current asset 5,740 (5,740) 0
Postretirement benefits 77 (37) (2,566)
Regulatory asset related to balancing and memorandum accounts (3,550) 0 0
Other noncurrent assets and noncurrent liabilities (1,503) 1,855 1,166
Other changes, net 575 (318) 860
Net cash provided by operating activities 74,367 64,204 37,167
Investing activities:      
Company-funded (99,635) (62,439) (95,536)
Contributions in aid of construction (6,199) (7,311) (4,364)
Additions to real estate investment (678) (156) (4,540)
Payments for business/asset acquisition and water rights (2,280) (4,040) (3,504)
Cost to retire utility plant, net of salvage (922) (1,816) (757)
Proceeds from sale of California Water Service Group stock 0 0 33,938
Proceeds from sale of real estate investment 5,517 0 0
Proceeds from sale of utility property 0 43 0
Net cash used in investing activities (104,197) (75,719) (74,763)
Financing activities:      
Borrowings from line of credit 16,300 17,600 62,300
Repayments of line of credit (1,000) (21,600) (64,100)
Long-term borrowings 0 50,000 50,000
Repayments of long-term borrowings (3,696) (1,094) (790)
Debt issuance costs (33) (87) (856)
Dividends paid (13,231) (12,823) (12,603)
Exercise of stock options and similar instruments 989 564 692
Tax benefits realized from share options exercised 97 7 41
Receipts of advances and contributions in aid of construction 8,407 6,149 5,428
Refunds of advances for construction (2,215) (2,197) (2,202)
Net cash provided by financing activities 5,618 36,519 37,910
Net change in cash and cash equivalents (24,212) 25,004 314
Cash and cash equivalents, beginning of year 2,522 26,734 1,730
Cash and cash equivalents, end of year 26,734 1,730 1,416
Cash paid (received) during the year for:      
Interest 21,206 20,307 18,070
Income Taxes Paid, Net (1,445) (2,930) 15,326
Supplemental disclosure of non-cash activities:      
Increase (decrease) in accrued payables for construction costs capitalized 355 1,971 (1,389)
Utility property installed by developers 4,073 567 341
Obligations relieved related to acquisition of certain water service assets $ 0 $ (726) $ 0