Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 6,310	$ 6,061
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,368	16,341
Deferred income taxes	3,455	3,991
Share-based compensation	283	328
Loss on sale of utility property	0	23
Changes in operating assets and liabilities:
Accounts receivable and accrued unbilled utility revenue	(8,723)	(7,770)
Accounts payable, purchased power and other current liabilities	321	884
Accrued groundwater extraction charges and purchased water	3,623	2,643
Tax receivable and accrued taxes	3,553	4,811
Accrued interest	(17)	19
Accrued payroll	69	1,049
Other current asset	1,856	0
Postretirement benefits	2,667	1,710
Other charges, net	885	(399)
NET CASH PROVIDED BY OPERATING ACTIVITIES	31,650	29,691
INVESTING ACTIVITIES:
Company-funded	(40,792)	(28,289)
Contributions in aid of construction	(1,822)	(1,771)
Additions to real estate investment	(48)	(112)
Payments for business/asset acquisition and water rights	(1,808)	(1,776)
Cost to retire utility plant, net of salvage	(92)	(1,715)
Proceeds from sale of utility property	0	43
NET CASH USED IN INVESTING ACTIVITIES	(44,562)	(33,620)
FINANCING ACTIVITIES:
Borrowings from line of credit	0	10,600
Repayments of line of credit	0	(7,800)
Long-term borrowings	0	50,000
Repayments of long-term borrowings	(460)	(736)
Debt issuance costs	(33)	(87)
Dividends paid	(6,610)	(6,409)
Exercise of stock options and similar instruments	405	262
Tax benefits realized from share options exercised	43	7
Receipts of advances and contributions in aid of construction	3,118	2,746
Refunds of advances for construction	(1,027)	(1,028)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(4,564)	47,555
NET CHANGE IN CASH AND CASH EQUIVALENTS	(17,476)	43,626
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	26,734	1,730
CASH AND CASH EQUIVALENTS, END OF PERIOD	9,258	45,356
Cash paid (received) during the period for:
Interest	10,639	9,642
Income taxes	(3,765)	(5,358)
Supplemental disclosure of non-cash activities:
Increase in accrued payables for construction costs capitalized	6,682	3,466
Utility property installed by developers	$ 107	$ 0