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REVENUE - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Utility $ 268,843 $ 314,467 $ 1,107,360 $ 960,300
Corporate Services and Intersegment        
Disaggregation of Revenue [Line Items]        
Utility (3,092) (4,032) (9,517) (20,508)
Residential        
Disaggregation of Revenue [Line Items]        
Utility 52,310 53,298 403,172 260,000
Commercial and Industrial        
Disaggregation of Revenue [Line Items]        
Utility 211,999 256,441 690,120 688,194
Commercial and Industrial | Corporate Services and Intersegment        
Disaggregation of Revenue [Line Items]        
Utility (3,092) (4,032) (9,517) (20,508)
OSS and Capacity Release        
Disaggregation of Revenue [Line Items]        
Utility 2,234 3,066 6,248 9,242
Other Customer        
Disaggregation of Revenue [Line Items]        
Utility 2,300 1,662 7,820 2,864
Gas        
Disaggregation of Revenue [Line Items]        
Utility 243,788 263,622 1,026,780 813,714
Gas | Corporate Services and Intersegment        
Disaggregation of Revenue [Line Items]        
Utility (1,173) (1,579) (3,807) (8,067)
Electric        
Disaggregation of Revenue [Line Items]        
Utility 12,296 34,993 40,688 90,179
Electric | Corporate Services and Intersegment        
Disaggregation of Revenue [Line Items]        
Utility (2,184) (2,453) (5,975) (6,134)
Solar        
Disaggregation of Revenue [Line Items]        
Utility 3,429 5,392 12,443 26,826
Solar | Corporate Services and Intersegment        
Disaggregation of Revenue [Line Items]        
Utility 0 0   (6,307)
CHP        
Disaggregation of Revenue [Line Items]        
Utility 7,218 8,151 21,371 23,165
Landfills        
Disaggregation of Revenue [Line Items]        
Utility 1,333 1,774 4,284 4,910
Other Product        
Disaggregation of Revenue [Line Items]        
Utility 779 535 1,794 1,506
Other Product | Corporate Services and Intersegment        
Disaggregation of Revenue [Line Items]        
Utility 265   265  
Wholesale Energy Operations        
Disaggregation of Revenue [Line Items]        
Utility 158,244 173,363 469,805 423,585
Wholesale Energy Operations | Commercial and Industrial        
Disaggregation of Revenue [Line Items]        
Utility 158,244 173,363 469,805 423,585
Wholesale Energy Operations | Gas        
Disaggregation of Revenue [Line Items]        
Utility 158,244 173,363 469,805 423,585
Retail Gas and Other Operations        
Disaggregation of Revenue [Line Items]        
Utility   12,487   60,854
Retail Gas and Other Operations | Commercial and Industrial        
Disaggregation of Revenue [Line Items]        
Utility   12,487   60,854
Retail Gas and Other Operations | Gas        
Disaggregation of Revenue [Line Items]        
Utility   12,487   60,854
Retail Electric Operations        
Disaggregation of Revenue [Line Items]        
Utility 14,480 37,446 46,663 96,313
Retail Electric Operations | Residential        
Disaggregation of Revenue [Line Items]        
Utility 4,205 9,691 10,966 24,178
Retail Electric Operations | Commercial and Industrial        
Disaggregation of Revenue [Line Items]        
Utility 10,275 27,755 35,697 72,135
Retail Electric Operations | Electric        
Disaggregation of Revenue [Line Items]        
Utility 14,480 37,446 46,663 96,313
On-Site Energy Production        
Disaggregation of Revenue [Line Items]        
Utility 11,980 15,317 38,098 61,208
On-Site Energy Production | Commercial and Industrial        
Disaggregation of Revenue [Line Items]        
Utility 11,980 15,317 38,098 61,208
On-Site Energy Production | Solar        
Disaggregation of Revenue [Line Items]        
Utility 3,429 5,392 12,443 33,133
On-Site Energy Production | CHP        
Disaggregation of Revenue [Line Items]        
Utility 7,218 8,151 21,371 23,165
On-Site Energy Production | Landfills        
Disaggregation of Revenue [Line Items]        
Utility 1,333 1,774 4,284 4,910
Appliance Service Operations        
Disaggregation of Revenue [Line Items]        
Utility 514 509 1,529 1,480
Appliance Service Operations | Residential        
Disaggregation of Revenue [Line Items]        
Utility 514 509 1,529 1,480
Appliance Service Operations | Commercial and Industrial        
Disaggregation of Revenue [Line Items]        
Utility     0  
Appliance Service Operations | Other Product        
Disaggregation of Revenue [Line Items]        
Utility 514 509 1,529 1,480
SJG        
Disaggregation of Revenue [Line Items]        
Utility 55,200 49,500 335,200 307,500
SJG | SJG Utility Operations        
Disaggregation of Revenue [Line Items]        
Utility 55,198 49,516 335,179 307,507
SJG | SJG Utility Operations | Residential        
Disaggregation of Revenue [Line Items]        
Utility 31,256 26,683 244,889 217,927
SJG | SJG Utility Operations | Commercial and Industrial        
Disaggregation of Revenue [Line Items]        
Utility 21,164 19,109 82,255 78,478
SJG | SJG Utility Operations | OSS and Capacity Release        
Disaggregation of Revenue [Line Items]        
Utility 2,234 3,066 6,248 9,242
SJG | SJG Utility Operations | Other Customer        
Disaggregation of Revenue [Line Items]        
Utility 544 658 1,787 1,860
SJG | SJG Utility Operations | Gas        
Disaggregation of Revenue [Line Items]        
Utility 55,198 49,516 335,179 307,507
ETG Utility Operations | SJG Utility Operations        
Disaggregation of Revenue [Line Items]        
Utility 30,624 29,117 220,503 29,117
ETG Utility Operations | SJG Utility Operations | Residential        
Disaggregation of Revenue [Line Items]        
Utility 16,092 16,193 143,584 16,193
ETG Utility Operations | SJG Utility Operations | Commercial and Industrial        
Disaggregation of Revenue [Line Items]        
Utility 12,799 11,946 71,013 11,946
ETG Utility Operations | SJG Utility Operations | OSS and Capacity Release        
Disaggregation of Revenue [Line Items]        
Utility   0 0 0
ETG Utility Operations | SJG Utility Operations | Other Customer        
Disaggregation of Revenue [Line Items]        
Utility 1,733 978 5,906 978
ETG Utility Operations | SJG Utility Operations | Gas        
Disaggregation of Revenue [Line Items]        
Utility 30,624 29,117 220,503 29,117
ELK Utility Operations | SJG Utility Operations        
Disaggregation of Revenue [Line Items]        
Utility 895 744 5,100 744
ELK Utility Operations | SJG Utility Operations | Residential        
Disaggregation of Revenue [Line Items]        
Utility 243 222 2,204 222
ELK Utility Operations | SJG Utility Operations | Commercial and Industrial        
Disaggregation of Revenue [Line Items]        
Utility 629 496 2,769 496
ELK Utility Operations | SJG Utility Operations | OSS and Capacity Release        
Disaggregation of Revenue [Line Items]        
Utility   0 0 0
ELK Utility Operations | SJG Utility Operations | Other Customer        
Disaggregation of Revenue [Line Items]        
Utility 23 26 127 26
ELK Utility Operations | SJG Utility Operations | Gas        
Disaggregation of Revenue [Line Items]        
Utility $ 895 718 $ 5,100 718
ELK Utility Operations | SJG Utility Operations | Other Product        
Disaggregation of Revenue [Line Items]        
Utility   $ 26   $ 26