CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating activities
Net income	$ 14,878	$ 14,643
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	17,319	17,065
Deferred income taxes	5,304	8,453
Amortization of investment tax credits	(157)	(154)
Allowance for equity funds used during construction	(999)	(106)
Net derivative losses	32	31
Changes in operating assets and liabilities:
Accounts receivable	(7,818)	(5,762)
Accrued unbilled revenues	14,184	12,221
Inventories	7,886	9,982
Other current assets	6,395	5,854
Accounts payable	(3,996)	(16,461)
Net regulatory assets and liabilities	3,359	1,346
Pension and other employee benefit obligations	(12,473)	(7,038)
Other current liabilities	2,082	40
Change in other noncurrent assets	(197)	45
Change in other noncurrent liabilities	(21)	(1,380)
Net cash provided by operating activities	45,778	38,779
Investing activities
Utility capital/construction expenditures	(36,748)	(26,200)
Allowance for equity funds used during construction	999	106
Other, net	1,034	(174)
Net cash used in investing activities	(34,715)	(26,268)
Financing activities
Proceeds from short-term borrowings, net	5,000	31,000
Proceeds from notes payable to affiliate	50	111,300
Repayments of notes payable to affiliate	0	(148,300)
Repayments of long-term debt	(16)	(13)
Dividends paid to parent	(16,225)	(8,442)
Net cash used in financing activities	(11,191)	(14,455)
Net change in cash and cash equivalents	(128)	(1,944)
Cash and cash equivalents at beginning of period	1,571	6,445
Cash and cash equivalents at end of period	1,443	4,501
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(6,546)	(6,430)
Cash (paid) received for income taxes, net	(833)	440
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 4,406	$ 1,630