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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net Income $ 53,577us-gaap_ProfitLoss $ 47,898us-gaap_ProfitLoss
Other Comprehensive Income, Net of Tax:    
Unrealized Gain on Available-for-Sale Securities 88us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1] 62us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1]
Unrealized Gain on Derivatives - Other 8sji_UnrealizedLossOnDerivativesOther [1] 66sji_UnrealizedLossOnDerivativesOther [1]
Other Comprehensive Loss of Affiliated Companies (95)sji_OtherComprehensiveIncomeLossofAffiliatedCompanies [1] (18)sji_OtherComprehensiveIncomeLossofAffiliatedCompanies [1]
Other Comprehensive Income - Net of Tax 1us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] 110us-gaap_OtherComprehensiveIncomeLossNetOfTax [1]
Comprehensive Income $ 53,578us-gaap_ComprehensiveIncomeNetOfTax $ 48,008us-gaap_ComprehensiveIncomeNetOfTax
[1] .