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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2013
Segment Information (Tables) [Line Items]  
Segment Information
(In thousands)     Non-     Consolidation/  
MGE Energy     Regulated Transmission All Elimination Consolidated
  Electric Gas Energy Investment Others Entries Total
Three Months Ended June 30, 2013            
Operating revenues$96,846$30,042$1,400$0$0$0$128,288
Interdepartmental revenues 129 2,816 10,691 0 0 (13,636) 0
Total operating revenues 96,975 32,858 12,091 0 0 (13,636) 128,288
Depreciation and amortization (6,314) (1,435) (1,781) 0 0 0 (9,530)
Other operating expenses (78,051) (29,572) (26) 0 (248) 13,636 (94,261)
Operating income (loss) 12,610 1,851 10,284 0 (248) 0 24,497
Other (deductions) income, net 485 (185) 0 2,309 102 0 2,711
Interest (expense) income, net (2,315) (759) (1,605) 0 22 0 (4,657)
Income (loss) before taxes 10,780 907 8,679 2,309 (124) 0 22,551
Income tax (provision) benefit (3,694) (606) (3,483) (927) 50 0 (8,660)
Net income (loss)$7,086$301$5,196$1,382$(74)$0$13,891
               
Three Months Ended June 30, 2012            
Operating revenues$96,339$18,629$2,253$0$0$0$117,221
Interdepartmental revenues 119 3,077 8,677 0 0 (11,873) 0
Total operating revenues 96,458 21,706 10,930 0 0 (11,873) 117,221
Depreciation and amortization (6,546) (1,389) (1,777) 0 0 0 (9,712)
Other operating expenses (72,265) (21,746) (37) 0 (253) 11,873 (82,428)
Operating income (loss) 17,647 (1,429) 9,116 0 (253) 0 25,081
Other income, net 96 27 0 2,242 184 0 2,549
Interest (expense) income, net (2,465) (695) (1,639) 0 35 0 (4,764)
Income (loss) before taxes 15,278 (2,097) 7,477 2,242 (34) 0 22,866
Income tax (provision) benefit (5,642) 933 (3,001) (900) 14 0 (8,596)
Net income (loss)$9,636$(1,164)$4,476$1,342$(20)$0$14,270
               
Six Months Ended June 30, 2013            
Operating revenues$190,340$102,509$2,676$0$0$0$295,525
Interdepartmental revenues 238 7,692 21,264 0 0 (29,194) 0
Total operating revenues 190,578 110,201 23,940 0 0 (29,194) 295,525
Depreciation and amortization (12,714) (2,860) (3,580) 0 0 0 (19,154)
Other operating expenses (152,976) (90,009) (63) 0 (392) 29,194 (214,246)
Operating income (loss) 24,888 17,332 20,297 0 (392) 0 62,125
Other (deductions) income, net 1,060 (23) 0 4,705 278 0 6,020
Interest (expense) income, net (4,719) (1,437) (3,218) 0 42 0 (9,332)
Income (loss) before taxes 21,229 15,872 17,079 4,705 (72) 0 58,813
Income tax (provision) benefit (7,127) (6,595) (6,740) (1,898) 22 0 (22,338)
Net income (loss)$14,102$9,277$10,339$2,807$(50)$0$36,475
               
Six Months Ended June 30, 2012            
Operating revenues$186,275$75,648$4,557$0$0$0$266,480
Interdepartmental revenues 228 6,063 17,353 0 0 (23,644) 0
Total operating revenues 186,503 81,711 21,910 0 0 (23,644) 266,480
Depreciation and amortization (13,024) (2,759) (3,553) 0 0 0 (19,336)
Other operating expenses (145,053) (71,487) (49) 0 (674) 23,644 (193,619)
Operating income (loss) 28,426 7,465 18,308 0 (674) 0 53,525
Other income, net 260 73 0 4,484 302 0 5,119
Interest (expense) income, net (5,192) (1,464) (3,284) 0 72 0 (9,868)
Income (loss) before taxes 23,494 6,074 15,024 4,484 (300) 0 48,776
Income tax (provision) benefit (8,427) (2,305) (6,030) (1,810) 114 0 (18,458)
Net income (loss)$15,067$3,769$8,994$2,674$(186)$0$30,318

(In thousands)     Non-   Consolidation/  
MGE     Regulated Transmission Elimination Consolidated
  Electric Gas Energy Investment Entries Total
Three Months Ended June 30, 2013           
Operating revenues$96,846$30,042$1,400$0$0$128,288
Interdepartmental revenues 129 2,816 10,691 0 (13,636) 0
Total operating revenues 96,975 32,858 12,091 0 (13,636) 128,288
Depreciation and amortization (6,314) (1,435) (1,781) 0 0 (9,530)
Other operating expenses* (81,579) (30,130) (3,509) 0 13,636 (101,582)
Operating income* 9,082 1,293 6,801 0 0 17,176
Other (deductions) income, net* 319 (233) 0 1,382 0 1,468
Interest expense, net (2,315) (759) (1,605) 0 0 (4,679)
Net income 7,086 301 5,196 1,382 0 13,965
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (6,860) (6,860)
Net income attributable to MGE$7,086$301$5,196$1,382$(6,860)$7,105
             
Three Months Ended June 30, 2012           
Operating revenues$96,339$18,629$2,253$0$0$117,221
Interdepartmental revenues 119 3,077 8,677 0 (11,873) 0
Total operating revenues 96,458 21,706 10,930 0 (11,873) 117,221
Depreciation and amortization (6,546) (1,389) (1,777) 0 0 (9,712)
Other operating expenses* (77,849) (20,797) (3,038) 0 11,873 (89,811)
Operating income (loss)* 12,063 (480) 6,115 0 0 17,698
Other income, net* 38 11 0 1,342 0 1,391
Interest expense, net (2,465) (695) (1,639) 0 0 (4,799)
Net income (loss) 9,636 (1,164) 4,476 1,342 0 14,290
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (6,080) (6,080)
Net income (loss) attributable to MGE$9,636$(1,164)$4,476$1,342$(6,080)$8,210
             
Six Months Ended June 30, 2013           
Operating revenues$190,340$102,509$2,676$0$0$295,525
Interdepartmental revenues 238 7,692 21,264 0 (29,194) 0
Total operating revenues 190,578 110,201 23,940 0 (29,194) 295,525
Depreciation and amortization (12,714) (2,860) (3,580) 0 0 (19,154)
Other operating expenses* (160,085) (96,598) (6,803) 0 29,194 (234,292)
Operating income* 17,779 10,743 13,557 0 0 42,079
Other (deductions) income, net* 1,042 (29) 0 2,807 0 3,820
Interest expense, net (4,719) (1,437) (3,218) 0 0 (9,374)
Net income 14,102 9,277 10,339 2,807 0 36,525
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (13,686) (13,686)
Net income attributable to MGE$14,102$9,277$10,339$2,807$(13,686)$22,839
             
Six Months Ended June 30, 2012           
Operating revenues$186,275$75,648$4,557$0$0$266,480
Interdepartmental revenues 228 6,063 17,353 0 (23,644) 0
Total operating revenues 186,503 81,711 21,910 0 (23,644) 266,480
Depreciation and amortization (13,024) (2,759) (3,553) 0 0 (19,336)
Other operating expenses* (153,357) (73,758) (6,079) 0 23,644 (209,550)
Operating income* 20,122 5,194 12,278 0 0 37,594
Other income, net* 137 39 0 2,674 0 2,850
Interest expense, net (5,192) (1,464) (3,284) 0 0 (9,940)
Net income 15,067 3,769 8,994 2,674 0 30,504
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (12,152) (12,152)
Net income attributable to MGE$15,067$3,769$8,994$2,674$(12,152)$18,352
             
*Amounts are shown net of the related tax expense, consistent with the presentation on the consolidated MGE Income Statement.

The following table shows segment information for MGE Energy's and MGE's assets and capital expenditures:
                  
  Utility  Consolidated
(In thousands)     Assets       Consolidation/ 
MGE Energy     not NonregulatedTransmission All Elimination  
  Electric Gas Allocated  Energy Investment Others Entries Total
Assets:                 
June 30, 2013$929,269$265,870$13,721 $317,538$62,837$412,833$(411,759)$1,590,309
December 31, 2012 888,444 285,468 18,559  323,216 61,064 413,291 (403,118) 1,586,924
Capital Expenditures:                 
Six Months Ended June 30, 2013$55,074$5,908$0 $2,155$0$0$0$63,137
Year ended Dec. 31, 2012 81,965 13,812 0  2,658 0 0 0 98,435

  Utility  Consolidated
(In thousands)     Assets        
MGE     not NonregulatedTransmission Elimination  
  Electric Gas Allocated  Energy Investment Entries Total
Assets:               
June 30, 2013$929,269$265,870$13,721 $317,488$62,837$(29,744)$1,559,441
December 31, 2012 888,444 285,468 18,559  323,166 61,064 (23,050) 1,553,651
Capital Expenditures:               
Six Months Ended June 30, 2013$55,074$5,908$0 $2,155$0$0$63,137
Year ended Dec. 31, 2012 81,965 13,812 0  2,658 0 0 98,435