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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
OPERATING REVENUES |  |  |  |  |  |  |  |
Utility | $ 374,703us-gaap_RegulatedOperatingRevenueGas |  | $ 394,528us-gaap_RegulatedOperatingRevenueGas |  | $ 583,430us-gaap_RegulatedOperatingRevenueGas |  | $ 627,997us-gaap_RegulatedOperatingRevenueGas |
Nonutility | 638,387us-gaap_UnregulatedOperatingRevenue |  | 1,185,041us-gaap_UnregulatedOperatingRevenue |  | 1,253,784us-gaap_UnregulatedOperatingRevenue |  | 1,829,977us-gaap_UnregulatedOperatingRevenue |
Total operating revenues | 1,013,090us-gaap_RegulatedAndUnregulatedOperatingRevenue |  | 1,579,569us-gaap_RegulatedAndUnregulatedOperatingRevenue |  | 1,837,214us-gaap_RegulatedAndUnregulatedOperatingRevenue |  | 2,457,974us-gaap_RegulatedAndUnregulatedOperatingRevenue |
OPERATING EXPENSES |  |  |  |  |  |  |  |
Gas Purchases - Utility | 129,281us-gaap_CostOfNaturalGasPurchases |  | 146,449us-gaap_CostOfNaturalGasPurchases |  | 213,544us-gaap_CostOfNaturalGasPurchases |  | 255,937us-gaap_CostOfNaturalGasPurchases |
Gas Purchases - Nonutility | 662,573us-gaap_CostOfGoodsAndServicesEnergyCommoditiesAndServices |  | 1,046,328us-gaap_CostOfGoodsAndServicesEnergyCommoditiesAndServices |  | 1,135,544us-gaap_CostOfGoodsAndServicesEnergyCommoditiesAndServices |  | 1,708,272us-gaap_CostOfGoodsAndServicesEnergyCommoditiesAndServices |
Gas Purchases - Related parties | 3,124us-gaap_RelatedPartiesAmountInCostOfSales |  | 3,039us-gaap_RelatedPartiesAmountInCostOfSales |  | 6,388us-gaap_RelatedPartiesAmountInCostOfSales |  | 6,339us-gaap_RelatedPartiesAmountInCostOfSales |
Operation and maintenance | 52,778us-gaap_OtherCostAndExpenseOperating |  | 61,273us-gaap_OtherCostAndExpenseOperating |  | 97,537us-gaap_OtherCostAndExpenseOperating |  | 103,296us-gaap_OtherCostAndExpenseOperating |
Regulatory rider expenses | 42,692us-gaap_UtilitiesOperatingExpenseOther |  | 38,211us-gaap_UtilitiesOperatingExpenseOther |  | 64,155us-gaap_UtilitiesOperatingExpenseOther |  | 58,043us-gaap_UtilitiesOperatingExpenseOther |
Depreciation and amortization | 15,204us-gaap_DepreciationAndAmortization |  | 12,828us-gaap_DepreciationAndAmortization |  | 29,590us-gaap_DepreciationAndAmortization |  | 25,394us-gaap_DepreciationAndAmortization |
Energy and other taxes | 24,632us-gaap_ExciseAndSalesTaxes |  | 24,429us-gaap_ExciseAndSalesTaxes |  | 38,953us-gaap_ExciseAndSalesTaxes |  | 41,457us-gaap_ExciseAndSalesTaxes |
Total operating expenses | 930,284us-gaap_OperatingExpenses |  | 1,332,557us-gaap_OperatingExpenses |  | 1,585,711us-gaap_OperatingExpenses |  | 2,198,738us-gaap_OperatingExpenses |
OPERATING INCOME | 82,806us-gaap_OperatingIncomeLoss |  | 247,012us-gaap_OperatingIncomeLoss |  | 251,503us-gaap_OperatingIncomeLoss |  | 259,236us-gaap_OperatingIncomeLoss |
Other income, net | 1,137us-gaap_OtherNonoperatingIncome |  | 712us-gaap_OtherNonoperatingIncome |  | 1,027us-gaap_OtherNonoperatingIncome |  | 1,839us-gaap_OtherNonoperatingIncome |
Interest expense, net of capitalized interest | 6,483us-gaap_InterestExpense |  | 6,306us-gaap_InterestExpense |  | 13,678us-gaap_InterestExpense |  | 12,601us-gaap_InterestExpense |
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES | 77,460us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 241,418us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 238,852us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 248,474us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Income tax provision | 20,144us-gaap_IncomeTaxExpenseBenefit |  | 71,680us-gaap_IncomeTaxExpenseBenefit |  | 61,011us-gaap_IncomeTaxExpenseBenefit |  | 73,185us-gaap_IncomeTaxExpenseBenefit |
Equity in earnings of affiliates | 3,587us-gaap_IncomeLossFromEquityMethodInvestments |  | 3,233us-gaap_IncomeLossFromEquityMethodInvestments |  | 6,382us-gaap_IncomeLossFromEquityMethodInvestments |  | 5,375us-gaap_IncomeLossFromEquityMethodInvestments |
NET INCOME | $ 60,903us-gaap_NetIncomeLoss |  | $ 172,971us-gaap_NetIncomeLoss |  | $ 184,223us-gaap_NetIncomeLoss |  | $ 180,664us-gaap_NetIncomeLoss |
EARNINGS PER COMMON SHARE |  |  |  |  |  |  |  |
BASIC (usd per share) | $ 0.71us-gaap_EarningsPerShareBasic |  | $ 2.06us-gaap_EarningsPerShareBasic |  | $ 2.17us-gaap_EarningsPerShareBasic |  | $ 2.15us-gaap_EarningsPerShareBasic |
DILUTED (usd per share) | $ 0.71us-gaap_EarningsPerShareDiluted | [1] | $ 2.04us-gaap_EarningsPerShareDiluted | [1] | $ 2.14us-gaap_EarningsPerShareDiluted | [1] | $ 2.13us-gaap_EarningsPerShareDiluted | [1]
DIVIDENDS DECLARED PER COMMON SHARE (usd per share) | $ 0.23us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.21us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.45us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.42us-gaap_CommonStockDividendsPerShareDeclared |
WEIGHTED AVERAGE SHARES OUTSTANDING |  |  |  |  |  |  |  |
BASIC (in shares) | 85,328us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 84,158us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 84,940us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 84,100us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
DILUTED (in shares) | 86,370us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 84,914us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 85,982us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 84,856us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
[1] | There were no anti-dilutive shares excluded from the calculation of diluted earnings per share for the three and six months ended March 31, 2015, and 2014.

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- Definition Amount of other operating expense of regulated operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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