Statements of Consolidated Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities:
Net Income (Loss)	$ (3,490)	$ 118,810	$ 105,107
Loss from Discontinued Operations	86	251	503
(Loss) Income from Continuing Operations	(3,404)	119,061	105,610
Adjustments to Reconcile Income from Continuing Operations to Net Cash Provided by Operating Activities:
Gain on Sale of Assets	(2,563)	0	0
Impairment Charges	91,299	0	0
Loss on Extinguishment of Debt	543	0	0
Depreciation and Amortization	123,486	109,818	91,042
Net Unrealized Loss (Gain) on Derivatives - Energy Related	13,667	(26,935)	(8,401)
Unrealized Loss (Gain) on Derivatives - Other	677	(647)	(96)
Provision for Losses on Accounts Receivable	6,949	6,907	14,730
CIP Receivable/Payable	915	(24,943)	(7,324)
Deferred Gas Costs - Net of Recoveries	(28,092)	11,753	28,648
Deferred SBC Costs - Net of Recoveries	(5,578)	(7,102)	9,557
Stock-Based Compensation Expense	4,254	3,892	2,213
Deferred and Noncurrent Income Taxes - Net	10,082	55,789	3,861
Environmental Remediation Costs - Net of Recoveries	(39,860)	(39,731)	(22,057)
Gas Plant Cost of Removal	(7,062)	(6,070)	(5,096)
Pension Contribution	(10,000)	0	(15,000)
Changes in:
Accounts Receivable	21	(67,160)	92,624
Inventories	5,589	387	9,226
Prepaid and Accrued Taxes - Net	(23,366)	4,253	(9,091)
Accounts Payable and Other Accrued Liabilities	58,858	112,199	(103,410)
Derivatives - Energy Related	899	6,723	(8,069)
Other Assets and Liabilities (See Note 1)	(6,989)	4,477	8,796
Cash Flows from Discontinued Operations	(4)	(44)	(1,033)
Net Cash Provided by Operating Activities	190,321	262,627	186,730
Cash Flows from Investing Activities:
Capital Expenditures (See Note 1)	(272,965)	(279,423)	(343,883)
Purchase of Available for Sale Securities	0	0	(6,059)
Proceeds from Sale of Property, Plant and Equipment	3,547	0	0
Investment in Long-Term Receivables	(9,324)	(10,886)	(19,033)
Proceeds from Long-Term Receivables	9,861	10,014	8,769
Notes Receivable	22,884	9,916	(9,916)
Purchase of Company-Owned Life Insurance	(9,180)	(2,398)	(2,328)
Acquisition of Subsidiary, Net of Cash & Restricted Cash Acquired (See Note 1)	0	0	3,133
Investment in Affiliate	(29,636)	(12,943)	(20,229)
Return of Investment in Affiliate	0	4,750	0
Advances on Notes Receivable - Affiliate	(2,451)	0	(2,075)
Net Repayment of Notes Receivable - Affiliate	0	672	4,276
Net Cash Used in Investing Activities (See Note 1)	(287,264)	(280,298)	(387,345)
Cash Flows from Financing Activities:
Net Borrowings from (Repayments of) Short-Term Credit Facilities	50,300	(135,600)	186,000
Proceeds from Issuance of Long-Term Debt	450,000	61,000	130,000
Payments for Issuance of Long-Term Debt	(14,204)	(147)	(64)
Principal Repayments of Long-Term Debt	(293,309)	(49,366)	(125,009)
Dividends on Common Stock	(87,308)	(82,380)	(70,158)
Net Settlement of Restricted Stock (See Note 1)	(751)	(387)	(333)
Proceeds from Sale of Common Stock	0	214,426	63,192
Payment of Lease Obligation	0	(10,600)	0
Net Cash Provided by (Used in) Financing Activities	104,728	(3,054)	183,628
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	7,785	(20,725)	(16,987)
Cash, Cash Equivalents and Restricted Cash at Beginning of Year (See Note 1)	31,910	52,635	69,622
Cash, Cash Equivalents and Restricted Cash at End of Year (See Note 1)	39,695	31,910	52,635
Cash paid (received) during the year for:
Interest (Net of Amounts Capitalized)	51,456	32,372	30,915
Income Taxes (Refunds) Paid	(8,348)	194	1,828
Supplemental Disclosures of Non-Cash Investing Activities
Capital Expenditures acquired on account but unpaid as of year-end	32,253	39,130	51,433
Notes Receivable from Affiliate Exchanged for Notes Receivable from a Third Party	0	0	16,389
Notes Receivable Exchanged for Accounts Payable	3,841	10,168	0
South Jersey Gas Company
Cash Flows from Operating Activities:
Net Income (Loss)	72,557	69,045	66,578
Adjustments to Reconcile Income from Continuing Operations to Net Cash Provided by Operating Activities:
Depreciation and Amortization	71,654	63,901	58,668
Unrealized Loss (Gain) on Derivatives - Other	(2,100)	(4,400)
Provision for Losses on Accounts Receivable	6,949	6,993	14,689
CIP Receivable/Payable	915	(24,943)	(7,324)
Deferred Gas Costs - Net of Recoveries	(28,092)	11,753	28,648
Deferred SBC Costs - Net of Recoveries	(5,578)	(7,102)	9,557
Environmental Remediation Costs - Net of Recoveries	(39,860)	(39,735)	(22,058)
Deferred and Noncurrent Income Taxes and Credits - Net	78,712	40,980	39,148
Deferred and Noncurrent Income Taxes - Net	78,712	40,980	39,297
Gas Plant Cost of Removal	(7,062)	(6,070)	(5,096)
Pension Contribution	(7,997)	0	(12,020)
Changes in:
Accounts Receivable	(28,129)	(24,867)	8,597
Inventories	(3,222)	2,696	11,198
Prepaid and Accrued Taxes - Net	(20,993)	3,980	(7,129)
Other Prepayments and Current Assets	1,183	(448)	(9,717)
Gas Purchases Payable	19,526	14,879	(13,423)
Accounts Payable and Other Accrued Liabilities	(1,753)	35,982	(2,264)
Other Assets	(16,925)	(7,065)	4,996
Other Liabilities (See Note 1)	14,784	2,183	1,504
Net Cash Provided by Operating Activities	106,669	142,162	164,552
Cash Flows from Investing Activities:
Capital Expenditures (See Note 1)	(248,864)	(225,287)	(207,785)
Investment in Long-Term Receivables	(9,324)	(10,886)	(19,033)
Proceeds from Long-Term Receivables	9,861	10,014	8,769
Notes Receivable	0	9,916	(9,916)
Purchase of Company-Owned Life Insurance	(4,875)	0	0
Net Cash Used in Investing Activities (See Note 1)	(253,202)	(216,243)	(227,965)
Cash Flows from Financing Activities:
Net Borrowings from (Repayments of) Short-Term Credit Facilities	(52,300)	(30,100)	33,000
Proceeds from Issuance of Long-Term Debt	400,000	61,000	80,000
Payments for Issuance of Long-Term Debt	(2,030)	(63)	(9)
Principal Repayments of Long-Term Debt	(215,909)	(27,909)	(11,009)
Dividends on Common Stock	(20,000)	0	(40,764)
Additional Investment by Shareholder	40,000	65,000	0
Net Cash Provided by (Used in) Financing Activities	149,761	67,928	61,218
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	3,228	(6,153)	(2,195)
Cash, Cash Equivalents and Restricted Cash at Beginning of Year (See Note 1)	1,391	7,544	9,739
Cash, Cash Equivalents and Restricted Cash at End of Year (See Note 1)	4,619	1,391	7,544
Cash paid (received) during the year for:
Interest (Net of Amounts Capitalized)	23,729	18,497	19,373
Income Taxes (Refunds) Paid	(8,476)	(1)	(1,665)
Supplemental Disclosures of Non-Cash Investing Activities
Capital Expenditures acquired on account but unpaid as of year-end	$ 25,889	$ 25,275	$ 24,857