Statements of Consolidated Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net Income	$ 97,046us-gaap_ProfitLoss	$ 81,593us-gaap_ProfitLoss	$ 91,608us-gaap_ProfitLoss
Loss from Discontinued Operations	582	796	1,168
Income from Continuing Operations	97,628	82,389	92,776
Adjustments to Reconcile Income from Continuing Operations to Net Cash Provided by Operating Activities:
Depreciation and Amortization	78,511	64,890	55,089
Net Unrealized Loss on Derivatives - Energy Related	6,592	25,823	193
Unrealized Loss (Gain) on Derivatives - Other	467us-gaap_UnrealizedGainLossOnDerivatives	(2,760)us-gaap_UnrealizedGainLossOnDerivatives	(660)us-gaap_UnrealizedGainLossOnDerivatives
Unrealized Loss on Property, Plant and Equipment	0	0	3,506
Provision for Losses on Accounts Receivable	9,519us-gaap_ProvisionForDoubtfulAccounts	4,245us-gaap_ProvisionForDoubtfulAccounts	4,932us-gaap_ProvisionForDoubtfulAccounts
CIP Receivable/Payable	15,226sji_TacCipReceivable	21,160sji_TacCipReceivable	(18,106)sji_TacCipReceivable
Deferred Gas Costs - Net of Recoveries	(44,976)	5,473	25,050
Deferred SBC Costs - Net of Recoveries	11,048sji_DeferredSbcCostsNetOfRecoveries	2,393sji_DeferredSbcCostsNetOfRecoveries	(4,183)sji_DeferredSbcCostsNetOfRecoveries
Stock-Based Compensation Expense	1,893us-gaap_ShareBasedCompensation	3,001us-gaap_ShareBasedCompensation	2,992us-gaap_ShareBasedCompensation
Deferred and Noncurrent Income Taxes - Net	1,670us-gaap_DeferredIncomeTaxExpenseBenefit	(21,549)us-gaap_DeferredIncomeTaxExpenseBenefit	20,306us-gaap_DeferredIncomeTaxExpenseBenefit
Environmental Remediation Costs - Net	(8,265)us-gaap_EnvironmentalRemediationExpense	(367)us-gaap_EnvironmentalRemediationExpense	(186)us-gaap_EnvironmentalRemediationExpense
Gas Plant Cost of Removal	(4,848)	(6,092)	(2,133)
Pension Contribution	0us-gaap_PensionContributions	(12,700)us-gaap_PensionContributions	(25,000)us-gaap_PensionContributions
Changes in:
Accounts Receivable	(14,323)	(67,825)	(59,701)
Inventories	(4,787)us-gaap_IncreaseDecreaseInInventories	(2,449)us-gaap_IncreaseDecreaseInInventories	13,481us-gaap_IncreaseDecreaseInInventories
Prepaid and Accrued Taxes - Net	(5,822)sji_PrepaidAndAccruedTaxesNet	17,703sji_PrepaidAndAccruedTaxesNet	(4,635)sji_PrepaidAndAccruedTaxesNet
Accounts Payable and Other Accrued Liabilities	27,429	49,444	18,829
Derivatives - Energy Related	169	1,500	306
Other Assets and Liabilities	(5,444)	(3,769)	(4,211)
Cash Flows from Discontinued Operations	(355)	(975)	(819)
Net Cash Provided by Operating Activities	161,332	159,535	117,826
Cash Flows from Investing Activities:
Capital Expenditures	(342,578)	(316,644)	(253,845)
Proceeds from Sale of Property, Plant and Equipment	53	0	29
Net (Purchase of) Proceeds from Sale of Restricted Investments in Margin Accounts	(22,337)	(25,164)	755
Investment in Long-Term Receivables	(13,024)sji_InvestmentInLongTermReceivables	(7,182)sji_InvestmentInLongTermReceivables	(6,243)sji_InvestmentInLongTermReceivables
Proceeds from Long-Term Receivables	6,544sji_ProceedsFromLongTermReceivables	5,764sji_ProceedsFromLongTermReceivables	8,182sji_ProceedsFromLongTermReceivables
Purchase of Company Owned Life Insurance	(1,250)	(5,149)	(4,547)
Investment in Affiliate	0	(2,973)	(39,431)
Advances on Notes Receivable - Affiliate	(7,521)us-gaap_PaymentsForAdvanceToAffiliate	(19,349)us-gaap_PaymentsForAdvanceToAffiliate	(67,943)us-gaap_PaymentsForAdvanceToAffiliate
Repayment of Notes Receivable - Affiliate	5,094	124,946	13,402
Other	0	(41)	(6,276)
Net Cash Used in Investing Activities	(375,019)	(245,792)	(355,917)
Cash Flows from Financing Activities:
Net (Repayments of) Borrowings from Short-Term Credit Facilities	(108,200)	65,000	17,500
Proceeds from Issuance of Long-Term Debt	329,000	50,000	235,000
Payments for Issuance of Long-Term Debt	(2,184)us-gaap_PaymentsOfDebtIssuanceCosts	(411)us-gaap_PaymentsOfDebtIssuanceCosts	(1,788)us-gaap_PaymentsOfDebtIssuanceCosts
Principal Repayments of Long-Term Debt	(21,000)us-gaap_RepaymentsOfLongTermDebt	(25,000)us-gaap_RepaymentsOfLongTermDebt	(35,000)us-gaap_RepaymentsOfLongTermDebt
Premium for Early Retirement of Debt	0sji_EarlyRepaymentOfDebtPremium	0sji_EarlyRepaymentOfDebtPremium	(700)sji_EarlyRepaymentOfDebtPremium
Dividends on Common Stock	(63,869)us-gaap_PaymentsOfDividendsCommonStock	(57,679)us-gaap_PaymentsOfDividendsCommonStock	(50,942)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from Sale of Common Stock	80,680	54,028	70,241
Other	(387)	(501)	880
Net Cash Provided by Financing Activities	214,040	85,437	235,191
Net Increase (Decrease) in Cash and Cash Equivalents	353	(820)	(2,900)
Cash and Cash Equivalents at Beginning of Year	3,818	4,638	7,538
Cash and Cash Equivalents at End of Year	4,171	3,818	4,638
Cash paid during the year for:
Interest (Net of Amounts Capitalized)	28,854us-gaap_InterestPaidNet	18,584us-gaap_InterestPaidNet	18,442us-gaap_InterestPaidNet
Income Taxes (Net of Refunds)	6,858us-gaap_IncomeTaxesPaidNet	(12,387)us-gaap_IncomeTaxesPaidNet	218us-gaap_IncomeTaxesPaidNet
Supplemental Disclosures of Non-Cash Investing Activities
Capital Expenditures acquired on account but unpaid as of year-end	36,491	44,874	34,086
Reclass from Notes Receivable Affiliate to Investment in Affiliates	0	0	2,952
Notes Receivable from Affiliate Exchanged for Notes Receivable from a Third Party	$ 0	$ 7,882	$ 0

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity).

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The net cash inflow or outflow from the costs of disposing of plant, whether by demolishing, dismantling, abandoning, sale, and so forth during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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The cash outflow for payments to purchase life insurance policies for which the entity is the beneficiary.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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The cash inflow from the collection of money previously advanced to an entity that is related to it but not strictly controlled.

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Amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan.

+ References

No definition available.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open agreements to purchase or sell energy at some future point, held at each balance sheet date, that was included in earnings for the period.

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