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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
CASH FLOW FROM OPERATING ACTIVITIES:        
Net income $ 71,879us-gaap_ProfitLoss $ 70,697us-gaap_ProfitLoss $ 142,330us-gaap_ProfitLoss $ 134,896us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation and amortization 67,467us-gaap_DepreciationAndAmortization 62,891us-gaap_DepreciationAndAmortization 257,603us-gaap_DepreciationAndAmortization 240,775us-gaap_DepreciationAndAmortization
Deferred income taxes 7,584us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 13,692us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 58,201us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 42,090us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Changes in current assets and liabilities:        
Accounts receivable, net of allowances (31,850)us-gaap_IncreaseDecreaseInAccountsReceivable 13,958us-gaap_IncreaseDecreaseInAccountsReceivable (49,491)us-gaap_IncreaseDecreaseInAccountsReceivable 2,806us-gaap_IncreaseDecreaseInAccountsReceivable
Accrued utility revenue 29,500us-gaap_IncreaseDecreaseInOtherReceivables 28,600us-gaap_IncreaseDecreaseInOtherReceivables (300)us-gaap_IncreaseDecreaseInOtherReceivables (500)us-gaap_IncreaseDecreaseInOtherReceivables
Deferred purchased gas costs 59,423us-gaap_IncreaseDecreaseInDeferredGasCost (56,979)us-gaap_IncreaseDecreaseInDeferredGasCost 47,063us-gaap_IncreaseDecreaseInDeferredGasCost (116,678)us-gaap_IncreaseDecreaseInDeferredGasCost
Accounts payable (49,173)us-gaap_IncreaseDecreaseInAccountsPayable (66,641)us-gaap_IncreaseDecreaseInAccountsPayable (24,031)us-gaap_IncreaseDecreaseInAccountsPayable (1,042)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued taxes 49,782us-gaap_IncreaseDecreaseInPropertyAndOtherTaxesPayable 33,400us-gaap_IncreaseDecreaseInPropertyAndOtherTaxesPayable 2,809us-gaap_IncreaseDecreaseInPropertyAndOtherTaxesPayable 13,592us-gaap_IncreaseDecreaseInPropertyAndOtherTaxesPayable
Other current assets and liabilities 31,548us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 36,522us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 18,405us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 7,465us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Gains on sale (1,526)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (2,429)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (5,268)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (5,707)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Changes in undistributed stock compensation 462us-gaap_ShareBasedCompensation 2,761us-gaap_ShareBasedCompensation 5,674us-gaap_ShareBasedCompensation 7,060us-gaap_ShareBasedCompensation
AFUDC (396)us-gaap_IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction (498)us-gaap_IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction (1,893)us-gaap_IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction (2,301)us-gaap_IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction
Changes in other assets and deferred charges (13,336)us-gaap_IncreaseDecreaseInOtherOperatingAssets (11,134)us-gaap_IncreaseDecreaseInOtherOperatingAssets (23,934)us-gaap_IncreaseDecreaseInOtherOperatingAssets (20,994)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Changes in other liabilities and deferred credits 876us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 17,155us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (500)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 53,141us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities 222,240us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 141,995us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 426,668us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 354,603us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOW FROM INVESTING ACTIVITIES:        
Construction expenditures and property additions (90,391)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (76,892)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (410,397)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (387,931)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisition of businesses, net of cash acquired (9,261)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired   (199,758)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Restricted cash     1,233us-gaap_IncreaseDecreaseInRestrictedCash  
Changes in customer advances 5,446swx_ChangeInCustomerAdvances 4,105swx_ChangeInCustomerAdvances 21,704swx_ChangeInCustomerAdvances 10,972swx_ChangeInCustomerAdvances
Miscellaneous inflows 2,835swx_ProceedsFromOtherInvestingActivities 3,593swx_ProceedsFromOtherInvestingActivities 10,853swx_ProceedsFromOtherInvestingActivities 10,458swx_ProceedsFromOtherInvestingActivities
Miscellaneous outflows     (1,400)swx_PaymentsForOtherInvestingActivities  
Net cash used in investing activities (91,371)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (69,194)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (577,765)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (366,501)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOW FROM FINANCING ACTIVITIES:        
Issuance of common stock, net 8,791us-gaap_ProceedsFromIssuanceOfCommonStock 107us-gaap_ProceedsFromIssuanceOfCommonStock 9,089us-gaap_ProceedsFromIssuanceOfCommonStock 567us-gaap_ProceedsFromIssuanceOfCommonStock
Dividends paid (17,023)us-gaap_PaymentsOfDividendsCommonStock (15,343)us-gaap_PaymentsOfDividendsCommonStock (67,955)us-gaap_PaymentsOfDividendsCommonStock (61,220)us-gaap_PaymentsOfDividendsCommonStock
Issuance of long-term debt, net 50,295us-gaap_ProceedsFromIssuanceOfLongTermDebt 1,025us-gaap_ProceedsFromIssuanceOfLongTermDebt 318,498us-gaap_ProceedsFromIssuanceOfLongTermDebt 307,651us-gaap_ProceedsFromIssuanceOfLongTermDebt
Retirement of long-term debt (18,082)us-gaap_RepaymentsOfLongTermDebt (3,781)us-gaap_RepaymentsOfLongTermDebt (153,456)us-gaap_RepaymentsOfLongTermDebt (71,294)us-gaap_RepaymentsOfLongTermDebt
Change in credit facility and commercial paper (150,000)swx_ProceedsFromRepaymentsOfLinesOfCreditAndCommercialPaper (10,000)swx_ProceedsFromRepaymentsOfLinesOfCreditAndCommercialPaper   (113,000)swx_ProceedsFromRepaymentsOfLinesOfCreditAndCommercialPaper
Change in short-term debt (5,000)us-gaap_ProceedsFromRepaymentsOfShortTermDebt      
Principal payments on capital lease obligations (386)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations   (820)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations  
Other (329)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (520)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (1,066)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 1,479us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities (131,734)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (28,512)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 104,290us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 64,183us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effects of currency translation on cash and cash equivalents (688)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations   (546)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations  
Change in cash and cash equivalents (1,553)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 44,289us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (47,353)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 52,285us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 39,566us-gaap_CashAndCashEquivalentsAtCarryingValue 41,077us-gaap_CashAndCashEquivalentsAtCarryingValue 85,366us-gaap_CashAndCashEquivalentsAtCarryingValue 33,081us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 38,013us-gaap_CashAndCashEquivalentsAtCarryingValue 85,366us-gaap_CashAndCashEquivalentsAtCarryingValue 38,013us-gaap_CashAndCashEquivalentsAtCarryingValue 85,366us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental information:        
Interest paid, net of amounts capitalized 10,497us-gaap_InterestPaidNet 10,474us-gaap_InterestPaidNet 65,575us-gaap_InterestPaidNet 56,058us-gaap_InterestPaidNet
Income taxes paid $ 2,101us-gaap_IncomeTaxesPaidNet $ 238us-gaap_IncomeTaxesPaidNet $ 26,110us-gaap_IncomeTaxesPaidNet $ 6,454us-gaap_IncomeTaxesPaidNet