STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flows from Operating Activities:
Net Income	$ 52,889	$ 43,925	$ 39,195
Provided by Operating Activities:
Depreciation and Amortization	41,959	39,502	34,507
Provision for Losses on Accounts Receivable	1,410	3,741	2,418
CIP Receivable	(1,289)	4,381	5,376
Deferred Gas Costs - Net of Recoveries	(37,343)	22,492	(7,910)
Deferred SBC Costs - Net of Recoveries	(4,402)	(2,344)	(119)
Environmental Remediation Costs - Net of Recoveries	(13,612)	(3,530)	(444)
Deferred and Noncurrent Income Taxes and Credits - Net	35,037	24,540	22,104
Gas Plant Cost of Removal	(1,590)	(1,596)	(1,678)
Changes in:
Accounts Receivable	37,428	(13,262)	3,526
Inventories	(6,285)	5,945	47,934
Prepaid and Accrued Taxes - Net	(7,831)	(8,744)	4,321
Other Prepayments and Current Assets	(1,420)	(105)	168
Gas Purchases Payable	(9,048)	7,285	(16,957)
Accounts Payable and Other Accrued Liabilities	21,079	(4,017)	(5,856)
Other Assets	(6,294)	(5,886)	(2,132)
Other Liabilities	9,789	252	(1,534)
Net Cash Provided by Operating Activities	110,477	112,579	122,919
Cash Flows from Investing Activities:
Capital Expenditures	(142,570)	(115,466)	(98,673)
Investment in Long-Term Receivables	(4,926)	(3,313)	(4,730)
Proceeds from Long-Term Receivables	6,312	2,901	5,399
Net Purchase of Restricted Investment in Margin Account	2,103	(4,169)	0
Net Cash Used in Investing Activities	(139,081)	(120,047)	(98,004)
Cash Flows from Financing Activities:
Net Borrowing from (Repayments of) Lines of Credit	67,700	(50,500)	(5,150)
Proceeds from Issuance of Long-Term Debt	0	115,000	0
Principal Repayments of Long-Term Debt	(25,000)	(10,000)	(9,873)
Payments for Issuance of Long-Term Debt	(43)	(1,215)	(178)
Dividends on Common Stock	(12,664)	(45,905)	(10,002)
Excess Tax Benefit from Restricted Stock Plan	85	125	53
Net Cash Provided by (Used in) Financing Activities	30,078	7,505	(25,150)
Net Increase (Decrease) in Cash and Cash Equivalents	1,474	37	(235)
Cash and Cash Equivalents at Beginning of Period	2,030	1,993	2,228
Cash and Cash Equivalents at End of Period	3,504	2,030	1,993
Supplemental Disclosures of Cash Flow Information
Interest (Net of Amounts Capitalized)	20,068	17,611	17,926
Income Taxes (Net of Refunds)	(1,044)	14,816	(4,308)
Supplemental Disclosures of Noncash Investing Activities
Capital property and equipment acquired on account but not paid at year-end	$ 12,171	$ 14,906	$ 19,166