CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Plant and property, at original cost:
Electric and water	$ 2,123,361	$ 2,074,748
Natural gas	68,467	66,918
Other	37,183	34,984
Construction work in progress	76,658	24,141
Total plant and property, Gross	2,305,669	2,200,791
Accumulated depreciation and amortization	673,202	637,139
Total plant and property, Net	1,632,467	1,563,652
Current assets:
Cash and cash equivalents	3,171	5,408
Restricted cash	4,357	4,357
Accounts receivable - trade, net of allowance $1,355 and $1,138, respectively	46,788	42,296
Accrued unbilled revenues	14,077	20,326
Accounts receivable - other	14,456	16,269
Fuel, materials and supplies	60,939	62,239
Prepaid expenses and other	12,238	14,629
Regulatory assets	1,146	7,724
Total current assets	157,172	173,248
Noncurrent assets and deferred charges:
Regulatory assets	225,196	231,922
Goodwill	39,492	39,492
Unamortized debt issuance costs	7,765	9,331
Other	4,463	4,190
Total noncurrent assets and deferred charges	276,916	284,935
Total Assets	2,066,555	2,021,835
Capitalization and Liabilities
Common stock, $1 par value, 42,398,018 and 41,977,725 shares issued and outstanding, respectively	42,398	41,978
Capital in excess of par value	626,209	618,304
Retained earnings	48,097	33,707
Total common stockholders' equity	716,704	693,989
Long-term debt (net of current portion):
Obligations under capital lease	4,517	4,739
First mortgage bonds and secured debt	487,579	487,948
Unsecured debt	101,626	199,572
Total long-term debt	593,722	692,259
Total long-term debt and common stockholders' equity	1,310,426	1,386,248
Current liabilities:
Accounts payable and accrued liabilities	50,290	59,307
Current maturities of long-term debt	98,845	933
Short-term debt	2,000	12,000
Customer deposits	11,906	11,428
Interest accrued	12,648	5,958
Unrealized loss in fair value of derivative contracts	3,549	4,769
Taxes accrued	15,080	2,634
Total current liabilities	194,318	97,029
Commitments and contingencies (Note 7)
Noncurrent liabilities and deferred credits:
Regulatory liabilities	136,903	128,440
Deferred income taxes	285,568	263,933
Unamortized investment tax credits	18,941	19,226
Pension and other postretirement benefit obligations	97,417	103,371
Unrealized loss in fair value of derivative contracts	3,277	5,081
Other	19,705	18,507
Total noncurrent liabilities and deferred credits	561,811	538,558
Total Capitalization and Liabilities	$ 2,066,555	$ 2,021,835