CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Plant and property, at original cost:
Electric and water	$ 2,111,872	$ 2,074,748
Natural gas	67,712	66,918
Other	36,294	34,984
Construction work in progress	52,289	24,141
Total plant and property, Gross	2,268,167	2,200,791
Accumulated depreciation and amortization	664,167	637,139
Total plant and property, Net	1,604,000	1,563,652
Current assets:
Cash and cash equivalents	2,774	5,408
Restricted cash	4,357	4,357
Accounts receivable - trade, net of allowance $945 and $1,138, respectively	41,763	42,296
Accrued unbilled revenues	18,067	20,326
Accounts receivable - other	22,849	16,269
Fuel, materials and supplies	59,815	62,239
Prepaid expenses and other	12,112	14,629
Regulatory assets	1,355	7,724
Total current assets	163,092	173,248
Noncurrent assets and deferred charges:
Regulatory assets	230,860	231,922
Goodwill	39,492	39,492
Unamortized debt issuance costs	7,840	9,331
Other	4,268	4,190
Total noncurrent assets and deferred charges	282,460	284,935
Total Assets	2,049,552	2,021,835
Capitalization and Liabilities
Common stock, $1 par value, 42,307,786 and 41,977,725 shares issued and outstanding, respectively	42,308	41,978
Capital in excess of par value	624,021	618,304
Retained earnings	33,142	33,707
Total common stockholders' equity	699,471	693,989
Long-term debt (net of current portion):
Obligations under capital lease	4,592	4,739
First mortgage bonds and secured debt	487,639	487,948
Unsecured debt	101,608	199,572
Total long-term debt	593,839	692,259
Total long-term debt and common stockholders' equity	1,293,310	1,386,248
Current liabilities:
Accounts payable and accrued liabilities	51,312	59,307
Current maturities of long-term debt	98,923	933
Short-term debt	17,850	12,000
Customer deposits	11,821	11,428
Interest accrued	6,091	5,958
Unrealized loss in fair value of derivative contracts	4,068	4,769
Taxes accrued	10,695	2,634
Total current liabilities	200,760	97,029
Commitments and contingencies (Note 7)
Noncurrent liabilities and deferred credits:
Regulatory liabilities	137,098	128,440
Deferred income taxes	274,306	263,933
Unamortized investment tax credits	19,099	19,226
Pension and other postretirement benefit obligations	99,778	103,371
Unrealized loss in fair value of derivative contracts	5,734	5,081
Other	19,467	18,507
Total noncurrent liabilities and deferred credits	555,482	538,558
Total Capitalization and Liabilities	$ 2,049,552	$ 2,021,835