Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Utility plant:
Land	$ 8,893	$ 8,852
Depreciable plant and equipment	1,085,972	1,070,016
Construction in progress	24,177	18,527
Intangible assets	15,549	14,732
Property, Plant and Equipment, Gross	1,134,591	1,112,127
Less accumulated depreciation and amortization	364,526	355,914
Public Utilities, Property, Plant and Equipment, Net	770,065	756,213
Real estate investments	89,099	89,099
Less accumulated depreciation and amortization	10,991	10,557
Property, Plant and Equipment, Net	78,108	78,542
CURRENT ASSETS:
Cash and cash equivalents	19,261	26,734
Accounts receivable:
Customers, net of allowances for uncollectible accounts	12,625	12,541
Income tax	5,173	5,248
Other	1,298	746
Accrued unbilled utility revenue	13,667	15,318
Materials and supplies	1,021	991
Prepaid expenses	1,304	1,598
Other current asset	5,021	5,739
Assets, Current	59,370	68,915
OTHER ASSETS:
Investment in California Water Service Group	7,013	7,032
Unamortized debt issuance, broker and reacquisition costs	4,778	4,865
Regulatory assets, net	119,248	119,248
Other	3,862	3,995
Assets, Noncurrent	134,901	135,140
Assets	1,042,444	1,038,810
Shareholders’ equity:
Common stock, $0.521 par value; authorized 36,000,000 shares; issued and outstanding 18,619,232 shares on March 31, 2012 and 18,592,827 on December 31, 2011	9,698	9,684
Additional paid-in capital	24,992	24,552
Retained earnings	225,264	227,494
Accumulated other comprehensive income	2,263	2,274
Total shareholders’ equity	262,217	264,004
Long-term debt, less current portion	343,617	343,848
Capitalization, Long-term Debt and Equity	605,834	607,852
CURRENT LIABILITIES:
Current portion of long-term debt	828	838
Accrued groundwater extraction charges and purchased water	5,330	5,789
Purchased power	304	423
Accounts payable	10,798	7,417
Accrued interest	5,540	5,376
Accrued property taxes and other non-income taxes	2,108	1,298
Accrued payroll	2,924	2,744
Other current liabilities	4,138	4,403
Liabilities, Current	31,970	28,288
DEFERRED INCOME TAXES	133,820	133,541
UNAMORTIZED INVESTMENT TAX CREDITS	1,480	1,495
ADVANCES FOR CONSTRUCTION	66,057	67,333
CONTRIBUTIONS IN AID OF CONSTRUCTION	124,446	123,335
DEFERRED REVENUE	1,071	1,070
POSTRETIREMENT BENEFIT PLANS	70,337	68,855
OTHER NONCURRENT LIABILITIES	7,429	7,041
COMMITMENTS AND CONTINGENCIES	0	0
Liabilities and Stockholders' Equity	$ 1,042,444	$ 1,038,810