Consolidated Statement of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities:
Net income	$ 42,966	$ 50,496
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	34,855	31,927
Undistributed earnings from equity investments	353	(728)
Non-cash expenses related to qualified defined benefit pension plans	3,655	4,131
Contributions to qualified defined benefit pension plans	(16,445)	(10,000)
Deferred environmental expenditures	(1,770)	(4,286)
Other	(1,172)	(1,264)
Changes in assets and liabilities:
Receivables	79,711	88,920
Inventories	9,156	3,508
Taxes accrued	11,007	(8,029)
Accounts payable	(30,052)	(39,323)
Interest accrued	(55)	(38)
Deferred gas costs	2,682	(18,336)
Deferred tax liabilities	27,516	15,979
Other - net	6,328	(8,694)
Cash provided by operating activities	168,735	104,263
Investing activities:
Capital expenditures	(47,815)	(125,966)
Utility gas reserves	(16,152)	0
Restricted cash	(1)	34,614
Other	68	964
Cash used in investing activities	(63,900)	(90,388)
Financing activities:
Common stock issued (purchased) - net, including common stock expense	(70)	1,613
Long-term debt issued	0	0
Long-term debt retired	(10,000)	0
Change in short-term debt	(72,035)	4,875
Cash dividend payments on common stock	(23,204)	(22,035)
Other	717	382
Cash used in financing activities	(104,592)	(15,165)
Increase (decrease) in cash and cash equivalents	243	(1,290)
Cash and cash equivalents - beginning of period	3,457	8,432
Cash and cash equivalents - end of period	3,700	7,142
Supplemental disclosure of cash flow information:
Interest paid	20,770	20,370
Income taxes paid	$ 1,522	$ 21,100