Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Current assets:
Cash and cash equivalents	$ 25,862	$ 3,457	$ 2,501
Restricted cash	0	924	924
Accounts receivable	25,628	67,969	28,503
Accrued unbilled revenue	14,287	64,803	15,399
Allowance for uncollectible accounts	(1,733)	(2,950)	(1,736)
Regulatory assets	76,734	52,714	83,545
Derivative instruments	3,932	2,245	1,864
Inventory - Gas	73,572	70,672	80,955
Inventory - Materials and supplies	10,009	9,713	8,668
Gas Reserves	2,366	0	0
Income taxes receivable	5,019	41,066	6,762
Other current assets	14,871	19,652	11,282
Total current assets	250,547	330,265	238,667
Non-current assets:
Property, plant and equipment	2,632,498	2,576,402	2,528,703
Less: Accumulated depreciation	756,592	722,239	711,046
Total property, plant and equipment - net	1,875,906	1,854,163	1,817,657
Gas Reserves	28,125	0	0
Regulatory Assets	328,757	348,897	339,786
Derivative instruments	227	628	518
Other investments	69,022	69,094	68,851
Other non-current assets	15,256	13,569	15,898
Total non-current assets	2,317,293	2,286,351	2,242,710
Total assets	2,567,840	2,616,616	2,481,377
Capitalization:
Common stock - no par value; authorized 100,000 shares; issued and outstanding 26,673, 26,564 and 26,668 at March 31, 2011 and 2010, and December 31, 2010, respectively	346,197	342,978	342,271
Retained earnings	356,574	356,727	338,725
Accumulated other comprehensive income (loss)	(6,166)	(6,604)	(5,675)
Total common stock equity	696,605	693,101	675,321
Long-term debt	601,700	591,700	591,700
Total capitalization	1,298,305	1,284,801	1,267,021
Current liabilities:
Short-term debt	181,200	257,435	159,875
Current maturities of long-term debt	40,000	10,000	45,000
Accounts payable	50,117	93,243	79,629
Taxes accrued	11,117	10,579	10,601
Interest accrued	11,321	5,182	12,220
Regulatory liabilities	28,593	17,828	31,502
Derivative instruments	46,651	38,437	59,898
Other current liabilities	33,609	35,457	28,074
Total current liabilities	402,608	468,161	426,799
Deferred credits and other non-current liabilities:
Deferred tax liabilities	394,217	373,409	324,166
Regulatory Liabilities	266,907	258,031	252,425
Pension and other postretirement benefit liabilities	129,669	144,250	121,686
Derivative instruments	7,429	17,022	27,211
Other non-current liabilities	68,705	70,942	62,069
Total deferred credits and other non-current liabilities	866,927	863,654	787,557
Commitments and contingencies (see Note 14)	0	0	0
Total capitalization and liabilities	$ 2,567,840	$ 2,616,616	$ 2,481,377