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Statements of Consolidated Income (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Operating revenues	$ 349,000	$ 257,515	$ 804,671	$ 694,155
Operating expenses:
Purchased gas costs	21,459	15,969	119,673	129,931
Operation and maintenance	30,586	35,774	55,641	70,292
Production	19,765	16,532	35,876	33,153
Exploration	1,198	1,078	2,573	2,413
Selling, general and administrative	40,936	44,416	79,827	83,628
Depreciation, depletion and amortization	81,886	65,217	160,284	127,096
Total operating expenses	195,830	178,986	453,874	446,513
Operating income	153,170	78,529	350,797	247,642
Gain on disposition			22,785
Other income	18,046	2,573	24,850	5,627
Interest expense	33,287	34,080	66,139	68,214
Income before income taxes	137,929	47,022	332,293	185,055
Income taxes	50,175	17,022	122,284	66,990
Net income	$ 87,754	$ 30,000	$ 210,009	$ 118,065
Basic:
Weighted average common shares outstanding (in shares)	149,444	147,575	149,347	140,440
Net income (in dollars per share)	$ 0.59	$ 0.20	$ 1.41	$ 0.84
Diluted:
Weighted average common shares outstanding (in shares)	150,111	148,289	150,034	141,270
Net income (in dollars per share)	$ 0.58	$ 0.20	$ 1.40	$ 0.84
Dividends declared per common share (in dollars per share)	$ 0.22	$ 0.22	$ 0.44	$ 0.44

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Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

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