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CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data
3 Months Ended12 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Operating revenues           
Operating revenues        $ 4,347,634$ 4,719,835$ 4,869,111
Purchased gas cost           
Purchased gas cost        3,020,3933,382,3303,549,433
Gross profit242,044266,805453,668364,724241,392247,666445,444403,0031,327,2411,337,5051,319,678
Operating expenses           
Operation and maintenance        449,290460,513485,704
Depreciation and amortization        227,099211,589211,984
Taxes, other than income        178,683188,252180,242
Asset impairments        30,27005,382
Total operating expenses        885,342860,354883,312
Operating income41,33334,078211,199155,28938,53732,259219,757186,598441,899477,151436,366
Miscellaneous income (expense)        21,499(156)(3,067)
Interest charges        150,825154,360152,638
Income (loss) before income taxes        312,573322,635280,661
Income tax expense (benefit)        113,689124,36297,362
Income (loss) from continuing operations1,098(1,474)128,16071,100244(4,229)111,28390,975198,884198,273183,299
Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax8639084,0492,8971,2931,0752,8432,3558,7177,5667,679
Net income (loss)1,961(566)132,20973,9971,537(3,154)114,12693,330207,601205,839190,978
Income Loss From Continuing Operations Per Basic Share$ 0.01$ (0.02)$ 1.41$ 0.78$ 0$ (0.04)$ 1.19$ 0.97$ 2.18$ 2.14$ 1.99
Income Loss From Discontinued Operations Net Of Tax Per Basic Share$ 0.01$ 0.01$ 0.04$ 0.03$ 0.02$ 0.01$ 0.03$ 0.03$ 0.10$ 0.08$ 0.09
Basic net income (loss) per share$ 0.02$ (0.01)$ 1.45$ 0.81$ 0.02$ (0.03)$ 1.22$ 1.00$ 2.28$ 2.22$ 2.08
Income Loss From Continuing Operations Per Diluted Share$ 0.01$ (0.02)$ 1.41$ 0.78$ 0$ (0.04)$ 1.19$ 0.97$ 2.17$ 2.12$ 1.98
Income Loss From Discontinued Operations Net Of Tax Per Diluted Share$ 0.01$ 0.01$ 0.04$ 0.03$ 0.02$ 0.01$ 0.03$ 0.03$ 0.10$ 0.08$ 0.09
Diluted net income (loss) per share$ 0.02$ (0.01)$ 1.45$ 0.81$ 0.02$ (0.03)$ 1.22$ 1.00$ 2.27$ 2.20$ 2.07
Weighted average shares outstanding:           
Basic        90,20191,85291,117
Diluted        90,65292,42291,620
Natural Gas Distribution Segment [Member]
           
Operating revenues           
Operating revenues343,956407,0311,077,414703,462330,606396,3191,333,872781,8412,531,8632,842,6382,884,796
Purchased gas cost           
Purchased gas cost        1,487,4991,820,6271,887,192
Gross profit        1,044,3641,022,011997,604
Operating expenses           
Operation and maintenance        348,083355,357361,123
Depreciation and amortization        196,909185,147187,050
Taxes, other than income        161,371171,338166,854
Asset impairments        004,599
Total operating expenses        706,363711,842719,626
Operating income        338,001310,169277,978
Miscellaneous income (expense)        16,5571,5676,002
Interest charges        115,802118,319123,863
Income (loss) before income taxes        238,756193,417160,117
Income tax expense (benefit)        84,75575,03450,989
Income (loss) from continuing operations        154,001118,383109,128
Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax        8,7177,5667,679
Net income (loss)        162,718125,949116,807
Regulated Transmission and Storage Segment [Member]
           
Operating revenues           
Operating revenues61,82053,57054,97649,00756,01544,95755,18146,860219,373203,013209,658
Purchased gas cost           
Purchased gas cost        000
Gross profit        219,373203,013209,658
Operating expenses           
Operation and maintenance        70,40172,24985,249
Depreciation and amortization        25,99721,36820,413
Taxes, other than income        14,70012,35810,231
Asset impairments        00602
Total operating expenses        111,098105,975116,495
Operating income        108,27597,03893,163
Miscellaneous income (expense)        4,7151351,433
Interest charges        31,43231,17430,982
Income (loss) before income taxes        81,55865,99963,614
Income tax expense (benefit)        29,14324,51322,558
Income (loss) from continuing operations        52,41541,48641,056
Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax        000
Net income (loss)        52,41541,48641,056
Nonregulated Segment [Member]
           
Operating revenues           
Operating revenues474,437491,285583,531475,640494,205427,405677,032548,0162,024,8932,146,6582,283,988
Purchased gas cost           
Purchased gas cost        1,959,8932,032,5672,169,880
Gross profit        65,000114,091114,108
Operating expenses           
Operation and maintenance        32,30834,51741,368
Depreciation and amortization        4,1935,0744,521
Taxes, other than income        2,6124,5563,157
Asset impairments        30,2700181
Total operating expenses        69,38344,14749,227
Operating income        (4,383)69,94464,881
Miscellaneous income (expense)        6573,8596,399
Interest charges        4,01510,58414,350
Income (loss) before income taxes        (7,741)63,21956,930
Income tax expense (benefit)        (209)24,81523,815
Income (loss) from continuing operations        (7,532)38,40433,115
Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax        000
Net income (loss)        (7,532)38,40433,115
Intersegment Elimination [Member]
           
Operating revenues           
Operating revenues(90,953)(108,271)(134,424)(94,847)(102,245)(107,376)(157,935)(104,918)(428,495)(472,474)(509,331)
Purchased gas cost           
Purchased gas cost        (426,999)(470,864)(507,639)
Gross profit        (1,496)(1,610)(1,692)
Operating expenses           
Operation and maintenance        (1,502)(1,610)(2,036)
Depreciation and amortization        000
Taxes, other than income        000
Asset impairments        000
Total operating expenses        (1,502)(1,610)(2,036)
Operating income        60344
Miscellaneous income (expense)        (430)(5,717)(16,901)
Interest charges        (424)(5,717)(16,557)
Income (loss) before income taxes        000
Income tax expense (benefit)        000
Income (loss) from continuing operations        000
Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax        000
Net income (loss)        $ 0$ 0$ 0