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REVENUE - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Utility $ 475,956 $ 606,677
Corporate Services and Intersegment    
Disaggregation of Revenue [Line Items]    
Utility (2,003) (3,007)
Gas    
Disaggregation of Revenue [Line Items]    
Utility 462,399 579,612
Gas | Corporate Services and Intersegment    
Disaggregation of Revenue [Line Items]    
Utility (1,089) (1,400)
Electric    
Disaggregation of Revenue [Line Items]    
Utility 5,711 15,204
Electric | Corporate Services and Intersegment    
Disaggregation of Revenue [Line Items]    
Utility (1,283) (1,607)
Solar    
Disaggregation of Revenue [Line Items]    
Utility 1,907 2,576
Solar | Corporate Services and Intersegment    
Disaggregation of Revenue [Line Items]    
Utility 0  
CHP    
Disaggregation of Revenue [Line Items]    
Utility 3,502 7,359
Landfills    
Disaggregation of Revenue [Line Items]    
Utility 1,579 1,395
Other Product    
Disaggregation of Revenue [Line Items]    
Utility 858 531
Other Product | Corporate Services and Intersegment    
Disaggregation of Revenue [Line Items]    
Utility 369  
Residential    
Disaggregation of Revenue [Line Items]    
Utility 237,242 291,036
Commercial and Industrial    
Disaggregation of Revenue [Line Items]    
Utility 231,616 310,487
Commercial and Industrial | Corporate Services and Intersegment    
Disaggregation of Revenue [Line Items]    
Utility (2,003) (3,007)
OSS and Capacity Release    
Disaggregation of Revenue [Line Items]    
Utility 2,609 1,770
Other Customer    
Disaggregation of Revenue [Line Items]    
Utility 4,489 3,384
Wholesale Energy Operations | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 138,995 199,767
Wholesale Energy Operations | Gas | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 138,995 199,767
Wholesale Energy Operations | Commercial and Industrial | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 138,995 199,767
Retail Electric Operations | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 6,994 16,811
Retail Electric Operations | Electric | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 6,994 16,811
Retail Electric Operations | Residential | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility   3,808
Retail Electric Operations | Commercial and Industrial | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 6,994 13,003
On-Site Energy Production | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 6,988 11,330
On-Site Energy Production | Solar | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 1,907 2,576
On-Site Energy Production | CHP | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 3,502 7,359
On-Site Energy Production | Landfills | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 1,579 1,395
On-Site Energy Production | Commercial and Industrial | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 6,988 11,330
Appliance Service Operations | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 489 531
Appliance Service Operations | Other Product | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 489 531
Appliance Service Operations | Residential | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 489 531
SJG    
Disaggregation of Revenue [Line Items]    
Utility 187,800 233,000
SJG | SJG Utility Operations | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 187,809 232,984
SJG | SJG Utility Operations | Gas | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 187,809 232,984
SJG | SJG Utility Operations | Residential | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 142,808 184,954
SJG | SJG Utility Operations | Commercial and Industrial | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 41,835 45,588
SJG | SJG Utility Operations | OSS and Capacity Release | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 2,609 1,770
SJG | SJG Utility Operations | Other Customer | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 557 672
ETG Utility Operations | SJG Utility Operations | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 133,406 144,784
ETG Utility Operations | SJG Utility Operations | Gas | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 133,406 144,784
ETG Utility Operations | SJG Utility Operations | Residential | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 92,409 99,989
ETG Utility Operations | SJG Utility Operations | Commercial and Industrial | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 37,148 42,148
ETG Utility Operations | SJG Utility Operations | Other Customer | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 3,849 2,647
ELK Utility Operations | SJG Utility Operations | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 3,278 3,477
ELK Utility Operations | SJG Utility Operations | Gas | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 3,278 3,477
ELK Utility Operations | SJG Utility Operations | Residential | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 1,536 1,754
ELK Utility Operations | SJG Utility Operations | Commercial and Industrial | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility 1,659 1,658
ELK Utility Operations | SJG Utility Operations | Other Customer | Operating Segments    
Disaggregation of Revenue [Line Items]    
Utility $ 83 $ 65