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SEGMENTS OF BUSINESS (Tables)
 6 Months Ended
Jun. 30, 2011
SEGMENTS OF BUSINESS [Abstract]  
Segments of Business
 Information about SJI's operations in different reportable operating segments is presented below (in thousands):

   
Three Months Ended
June 30,
   
Six Months Ended
 June 30,
 
   
2011
   
2010
   
2011
   
2010
 
Operating Revenues:
                   
Gas Utility Operations
 
$
65,187
   
$
61,344
   
$
245,510
   
$
258,060
 
Wholesale Energy Operations
   
6,475
     
(4,773
)
   
54,746
     
49,668
 
Retail Energy Operations:
                               
   Retail Gas and Other Operations
   
23,042
     
25,781
     
60,284
     
61,615
 
   Retail Electric Operations
   
54,258
     
58,868
     
114,153
     
90,818
 
   On-Site Energy Production
   
9,863
     
9,180
     
19,651
     
18,530
 
   Appliance Service Operations
   
4,154
     
4,580
     
8,588
     
9,292
 
        Subtotal Retail Energy Operations
   
91,317
     
98,409
     
202,676
     
180,255
 
Corporate & Services
   
6,070
     
5,508
     
12,034
     
10,911
 
    Subtotal
   
169,049
     
160,488
     
514,966
     
498,894
 
Intersegment Sales
   
(8,572
)
   
(8,840
)
   
(22,567
)
   
(17,963
)
   Total Operating Revenues
 
$
160,477
   
$
151,648
   
$
492,399
   
$
480,931
 

 
                                 
Operating Income (Loss):
                               
 Gas Utility Operations
 
$
7,065
   
$
9,224
   
$
65,558
   
$
57,015
 
 Wholesale Energy Operations
   
1,438
     
(9,645
)
   
11,095
     
10,649
 
 Retail Energy Operations:
                               
    Retail Gas and Other Operations
   
(59
)
   
(60
)
   
714
     
646
 
    Retail Electric Operations
   
2,978
     
14,233
     
6,841
     
2,430
 
    On-Site Energy Production
   
1,273
     
1,445
     
2,367
     
2,555
 
    Appliance Service Operations
   
(232
)
   
(260
)
   
(822
)
   
2
 
        Subtotal Retail Energy Operations
   
3,960
     
15,358
     
9,100
     
5,633
 
Corporate and Services
   
(24
)
   
481
     
(267
)
   
750
 
    Total Operating  Income
 
$
12,439
   
$
15,418
   
$
85,486
   
$
74,047
 
                                 
Depreciation and Amortization:
                               
Gas Utility Operations
 
$
10,375
   
$
9,740
   
$
20,678
   
$
19,225
 
Wholesale Energy Operations
   
68
     
65
     
134
     
137
 
Retail Energy Operations:
                               
   Retail Gas and Other Operations
   
10
     
9
     
17
     
18
 
   On-Site Energy Production
   
1,113
     
979
     
2,103
     
1,956
 
   Appliance Service Operations
   
75
     
87
     
149
     
176
 
      Subtotal Retail Energy Operations
   
1,198
     
1,075
     
2,269
     
2,150
 
Corporate and Services
   
178
     
208
     
339
     
338
 
 Total Depreciation and Amortization
 
$
11,819
   
$
11,088
   
$
23,420
   
$
21,850
 
                                 
Interest Charges:
                               
Gas Utility Operations
 
$
4,895
   
$
4,163
   
$
9,924
   
$
8,178
 
Wholesale Energy Operations
   
9
     
15
     
22
     
27
 
Retail Energy Operations:
                               
   Retail Gas and Other Operations
   
51
     
35
     
111
     
57
 
   On-Site Energy Production
   
1,513
     
1,402
     
2,526
     
2,402
 
     Subtotal Retail Energy Operations
   
1,564
     
1,437
     
2,637
     
2,459
 
Corporate and Services
   
689
     
260
     
1,184
     
317
 
Subtotal
   
7,157
     
5,875
     
13,767
     
10,981
 
Intersegment Borrowings
   
(923
)
   
(211
)
   
(1,552
)
   
(351
)
Total Interest Charges
 
$
6,234
   
$
5,664
   
$
12,215
   
$
10,630
 

Income Taxes:
                               
Gas Utility Operations
 
$
1,065
   
$
2,125
   
$
23,111
   
$
20,264
 
Wholesale Energy Operations
   
858
     
(3,828
)
   
5,020
     
4,649
 
Retail Energy Operations:
                               
  Retail Gas and Other Operations
   
24
     
120
     
538
     
490
 
  Retail Electric Operations
   
1,217
     
5,847
     
2,795
     
998
 
  On-Site Energy Production
   
(864
)
   
(3,815
)
   
(7,657
)
   
(4,355
)
  Appliance Service Operations
   
634
     
(102
)
   
1,633
     
12
 
     Subtotal Retail Energy Operations
   
1,011
     
2,050
     
(2,691
)
   
(2,855
)
Corporate and Services
   
70
     
(82
)
   
74
     
178
 
Total Income Taxes
 
$
3,004
   
$
265
   
$
25,514
   
$
22,236
 


Property Additions:
                               
Gas Utility Operations
 
$
38,638
   
$
26,802
   
$
59,076
   
$
58,533
 
Wholesale Energy Operations
   
6
     
-
     
30
     
6
 
Retail Energy Operations:
                               
  Retail Gas and Other Operations
   
2
     
6
     
15
     
14
 
  On-Site Energy Production
   
8,590
     
1,929
     
15,297
     
2,164
 
  Appliance Service Operations
   
132
     
63
     
133
     
74
 
     Subtotal Retail Energy Operations
   
8,724
     
1,998
     
15,445
     
2,252
 
Corporate and Services
   
103
     
296
     
382
     
501
 
 Total Property Additions
 
$
47,471
   
$
29,096
   
$
74,933
   
$
61,292
 

   
June 30,
 2011
   
December 31,
2010
 
Identifiable Assets:
         
Gas Utility Operations
 
$
1,492,205
   
$
1,468,635
 
Wholesale Energy Operations
   
225,022
     
237,978
 
 Retail Energy Operations:
               
   Retail Gas and Other Operations
   
25,426
     
21,532
 
   Retail Electric Operations
   
34,911
     
37,383
 
   On-Site Energy Production
   
181,084
     
147,064
 
   Appliance Service Operations
   
20,380
     
18,528
 
      Subtotal Retail Energy Operations
   
261,801
     
224,507
 
Discontinued Operations
   
466
     
890
 
Corporate and Services
   
100,763
     
168,788
 
    Intersegment Assets
   
(18,678
)
   
(24,183
)
 Total Identifiable Assets
 
$
2,061,579
   
$
2,076,615