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SHAREHOLDERS' EQUITY AND EARNINGS PER SHARE 2 (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]      
Shares Excluded From Potential Dilutive Shares 949,351sre_SharesExcludedFromPotentialDilutiveShares 641,751sre_SharesExcludedFromPotentialDilutiveShares 1,134,456sre_SharesExcludedFromPotentialDilutiveShares
Out Of The Money Stock Options [Member]      
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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= sre_OutOfMoneyStockOptionsMember
40,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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= sre_OutOfMoneyStockOptionsMember
In The Money Stock Options [Member]      
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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Restricted Stock [Member]      
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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= us-gaap_RestrictedStockMember
1,934us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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Restricted Stock Units      
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share 4,087us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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7,673us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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