Consolidated Balance Sheets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment:
Utility Plant, at original cost	$ 2,652,244	$ 2,424,134
Accumulated Depreciation	(498,161)	(471,222)
Nonutility Property and Equipment, at cost	741,027	821,942
Accumulated Depreciation	(194,913)	(151,084)
Property, Plant and Equipment - Net	2,700,197	2,623,770
Investments:
Available-for-Sale Securities	36	32
Restricted Investments	31,876	13,628
Investment in Affiliates	62,292	28,906
Total Investments	94,204	42,566
Current Assets:
Cash and Cash Equivalents	7,819	18,282
Accounts Receivable	202,379	222,339
Unbilled Revenues	73,377	59,680
Provision for Uncollectibles	(13,988)	(12,744)
Notes Receivable	0	1,454
Notes Receivable - Affiliate	4,913	2,461
Natural Gas in Storage, average cost	48,513	53,857
Materials and Supplies, average cost	4,239	6,753
Prepaid Taxes	41,355	17,471
Derivatives - Energy Related Assets	42,139	72,391
Other Prepayments and Current Assets	28,247	31,369
Total Current Assets	438,993	473,313
Regulatory and Other Noncurrent Assets:
Regulatory Assets	469,224	410,746
Derivatives - Energy Related Assets	5,988	8,502
Notes Receivable - Affiliate	13,275	13,275
Contract Receivables	28,721	29,037
Notes Receivable	0	25,271
Goodwill	3,578	4,838
Identifiable Intangible Assets	12,480	15,820
Other	98,426	83,429
Total Regulatory and Other Noncurrent Assets	631,692	590,918
Total Assets	3,865,086	3,730,567
Common Stock: Par Value $1.25 per share; Authorized 120,000,000 shares; Outstanding Shares: 79,549,080 (2017) and 79,478,055 (2016)
Common Stock Issued or Granted Under Stock Plans	89	10,640
Common Stock, Value	99,436	99,347
Premium on Common Stock	709,658	706,943
Treasury Stock (at par)	(271)	(266)
Accumulated Other Comprehensive Loss	(36,765)	(27,381)
Retained Earnings		510,597
Total Equity	1,192,409	1,289,240
Long-Term Debt	1,122,999	808,005
Total Capitalization	2,315,408	2,097,245
Current Liabilities:
Notes Payable	346,400	296,100
Current Portion of Long-Term Debt	63,809	231,909
Accounts Payable	284,899	243,669
Customer Deposits and Credit Balances	43,398	48,068
Environmental Remediation Costs	66,372	46,120
Taxes Accrued	2,932	2,082
Derivatives - Energy Related Liabilities	46,938	60,082
Derivatives - Other Current	748	681
Deferred Contract Revenues	259	0
Interest Accrued	9,079	6,231
Pension Benefits	2,388	2,463
Other Current Liabilities	15,860	15,219
Total Current Liabilities	883,082	952,624
Deferred Credits and Other Noncurrent Liabilities:
Deferred Income Taxes - Net	86,884	343,549
Pension and Other Postretirement Benefits	101,544	95,235
Environmental Remediation Costs	106,483	108,893
Asset Retirement Obligations	59,497	59,427
Derivatives - Energy Related Liabilities	6,025	4,540
Derivatives - Other Noncurrent	9,622	9,349
Regulatory Liabilities	287,105	49,121
Other	9,436	10,584
Total Deferred Credits and Other Noncurrent Liabilities	666,596	680,698
Commitments and Contingencies (Note 15)
Total Capitalization and Liabilities	3,865,086	3,730,567
South Jersey Gas Company
Property, Plant and Equipment:
Utility Plant, at original cost	2,652,244	2,424,134
Accumulated Depreciation	(498,161)	(471,222)
Property, Plant and Equipment - Net	2,154,083	1,952,912
Investments:
Restricted Investments	2,912	32
Total Investments	2,912	32
Current Assets:
Cash and Cash Equivalents	1,707	1,359
Accounts Receivable	78,571	69,651
Accounts Receivable - Related Parties	988	1,355
Unbilled Revenues	54,980	41,754
Provision for Uncollectibles	(13,799)	(12,570)
Natural Gas in Storage, average cost	14,932	11,621
Materials and Supplies, average cost	825	914
Prepaid Taxes	38,326	16,428
Derivatives - Energy Related Assets	7,327	5,434
Other Prepayments and Current Assets	12,670	13,853
Total Current Assets	196,527	149,799
Regulatory and Other Noncurrent Assets:
Regulatory Assets	469,224	410,746
Long-Term Receivables	25,851	25,758
Derivatives - Energy Related Assets	5	373
Other	17,372	12,303
Total Regulatory and Other Noncurrent Assets	512,452	449,180
Total Assets	2,865,974	2,551,923
Common Stock: Par Value $1.25 per share; Authorized 120,000,000 shares; Outstanding Shares: 79,549,080 (2017) and 79,478,055 (2016)
Common Stock, Value	5,848	5,848
Premium on Common Stock	355,744	315,827
Accumulated Other Comprehensive Loss	(25,997)	(14,934)
Retained Earnings	585,838	533,159
Total Equity	921,433	839,900
Long-Term Debt	758,052	423,177
Total Capitalization	1,679,485	1,263,077
Current Liabilities:
Notes Payable	52,000	104,300
Current Portion of Long-Term Debt	63,809	215,909
Accounts Payable - Commodity	43,341	23,815
Accounts Payable - Other	41,365	45,370
Accounts Payable - Related Parties	17,029	11,216
Customer Deposits and Credit Balances	41,656	45,816
Environmental Remediation Costs	66,040	45,018
Taxes Accrued	1,760	855
Derivatives - Energy Related Liabilities	9,270	1,372
Derivatives - Other Current	389	386
Interest Accrued	7,615	5,369
Pension Benefits	2,353	2,428
Other Current Liabilities	7,027	8,011
Total Current Liabilities	353,654	509,865
Deferred Credits and Other Noncurrent Liabilities:
Deferred Income Taxes - Net	280,746	469,408
Pension and Other Postretirement Benefits	88,871	81,800
Environmental Remediation Costs	105,656	108,029
Asset Retirement Obligations	58,714	58,674
Derivatives - Energy Related Liabilities	170	0
Derivatives - Other Noncurrent	6,639	6,979
Regulatory Liabilities	287,105	49,121
Other	4,934	4,970
Total Deferred Credits and Other Noncurrent Liabilities	832,835	778,981
Total Capitalization and Liabilities	$ 2,865,974	$ 2,551,923