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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Segment Information

The following tables show segment information for MGE Energy's operations for the indicated periods:

(In thousands)     Non-     Consolidation/  
MGE Energy     Regulated Transmission All Elimination Consolidated
  Electric Gas Energy Investment Others Entries Total
Three Months Ended September 30, 2013            
Operating revenues$119,836$18,864$1,399$0$0$0$140,099
Interdepartmental revenues 172 2,757 10,660 0 0 (13,589) 0
Total operating revenues 120,008 21,621 12,059 0 0 (13,589) 140,099
Depreciation and amortization (6,425) (1,497) (1,788) 0 0 0 (9,710)
Other operating expenses (82,414) (21,485) (33) (1) (145) 13,589 (90,489)
Operating income (loss) 31,169 (1,361) 10,238 (1) (145) 0 39,900
Other income, net 1,166 92 0 2,340 152 0 3,750
Interest (expense) income, net (2,309) (729) (1,596) 0 29 0 (4,605)
Income (loss) before taxes 30,026 (1,998) 8,642 2,339 36 0 39,045
Income tax (provision) benefit (11,021) 751 (3,469) (939) (14) 0 (14,692)
Net income (loss)$19,005$(1,247)$5,173$1,400$22$0$24,353
               
Three Months Ended September 30, 2012            
Operating revenues$118,914$16,587$2,337$0$0$0$137,838
Interdepartmental revenues 159 4,658 8,679 0 0 (13,496) 0
Total operating revenues 119,073 21,245 11,016 0 0 (13,496) 137,838
Depreciation and amortization (6,530) (1,399) (1,777) 0 0 0 (9,706)
Other operating expenses (78,823) (22,675) (36) 0 (206) 13,496 (88,244)
Operating income (loss) 33,720 (2,829) 9,203 0 (206) 0 39,888
Other income, net 342 97 0 2,280 137 0 2,856
Interest (expense) income, net (2,535) (715) (1,631) 0 32 0 (4,849)
Income (loss) before taxes 31,527 (3,447) 7,572 2,280 (37) 0 37,895
Income tax (provision) benefit (11,873) 1,565 (3,039) (909) 3 0 (14,253)
Net income (loss)$19,654$(1,882)$4,533$1,371$(34)$0$23,642
               
Nine Months Ended September 30, 2013            
Operating revenues$310,176$121,373$4,075$0$0$0$435,624
Interdepartmental revenues 410 10,449 31,924 0 0 (42,783) 0
Total operating revenues 310,586 131,822 35,999 0 0 (42,783) 435,624
Depreciation and amortization (19,139) (4,357) (5,368) 0 0 0 (28,864)
Other operating expenses (235,390) (111,494) (96) (1) (537) 42,783 (304,735)
Operating income (loss) 56,057 15,971 30,535 (1) (537) 0 102,025
Other income, net 2,226 69 0 7,045 430 0 9,770
Interest (expense) income, net (7,028) (2,166) (4,814) 0 71 0 (13,937)
Income (loss) before taxes 51,255 13,874 25,721 7,044 (36) 0 97,858
Income tax (provision) benefit (18,148) (5,844) (10,209) (2,837) 8 0 (37,030)
Net income (loss)$33,107$8,030$15,512$4,207$(28)$0$60,828
               
Nine Months Ended September 30, 2012            
Operating revenues$305,189$92,235$6,894$0$0$0$404,318
Interdepartmental revenues 387 10,721 26,032 0 0 (37,140) 0
Total operating revenues 305,576 102,956 32,926 0 0 (37,140) 404,318
Depreciation and amortization (19,554) (4,158) (5,330) 0 0 0 (29,042)
Other operating expenses (223,876) (94,162) (85) 0 (880) 37,140 (281,863)
Operating income (loss) 62,146 4,636 27,511 0 (880) 0 93,413
Other income, net 602 170 0 6,764 439 0 7,975
Interest (expense) income, net (7,727) (2,179) (4,915) 0 104 0 (14,717)
Income (loss) before taxes 55,021 2,627 22,596 6,764 (337) 0 86,671
Income tax (provision) benefit (20,300) (740) (9,069) (2,719) 117 0 (32,711)
Net income (loss)$34,721$1,887$13,527$4,045$(220)$0$53,960

(In thousands)     Non-   Consolidation/  
MGE     Regulated Transmission Elimination Consolidated
  Electric Gas Energy Investment Entries Total
Three Months Ended September 30, 2013           
Operating revenues$119,836$18,864$1,399$0$0$140,099
Interdepartmental revenues 172 2,757 10,660 0 (13,589) 0
Total operating revenues 120,008 21,621 12,059 0 (13,589) 140,099
Depreciation and amortization (6,425) (1,497) (1,788) 0 0 (9,710)
Other operating expenses* (93,481) (20,748) (3,502) (1) 13,589 (104,143)
Operating income (loss)* 20,102 (624) 6,769 (1) 0 26,246
Other income, net* 1,212 106 0 1,401 0 2,719
Interest expense, net (2,309) (729) (1,596) 0 0 (4,634)
Net income (loss) 19,005 (1,247) 5,173 1,400 0 24,331
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (6,861) (6,861)
Net income (loss) attributable to MGE$19,005$(1,247)$5,173$1,400$(6,861)$17,470
             
Three Months Ended September 30, 2012           
Operating revenues$118,914$16,587$2,337$0$0$137,838
Interdepartmental revenues 159 4,658 8,679 0 (13,496) 0
Total operating revenues 119,073 21,245 11,016 0 (13,496) 137,838
Depreciation and amortization (6,530) (1,399) (1,777) 0 0 (9,706)
Other operating expenses* (90,946) (21,180) (3,075) 0 13,496 (101,705)
Operating income (loss)* 21,597 (1,334) 6,164 0 0 26,427
Other income, net* 592 167 0 1,371 0 2,130
Interest expense, net (2,535) (715) (1,631) 0 0 (4,881)
Net income (loss) 19,654 (1,882) 4,533 1,371 0 23,676
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (6,153) (6,153)
Net income (loss) attributable to MGE$19,654$(1,882)$4,533$1,371$(6,153)$17,523
             
Nine Months Ended September 30, 2013           
Operating revenues$310,176$121,373$4,075$0$0$435,624
Interdepartmental revenues 410 10,449 31,924 0 (42,783) 0
Total operating revenues 310,586 131,822 35,999 0 (42,783) 435,624
Depreciation and amortization (19,139) (4,357) (5,368) 0 0 (28,864)
Other operating expenses* (253,566) (117,346) (10,305) (1) 42,783 (338,435)
Operating income (loss)* 37,881 10,119 20,326 (1) 0 68,325
Other income, net* 2,254 77 0 4,208 0 6,539
Interest expense, net (7,028) (2,166) (4,814) 0 0 (14,008)
Net income 33,107 8,030 15,512 4,207 0 60,856
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (20,547) (20,547)
Net income attributable to MGE$33,107$8,030$15,512$4,207$(20,547)$40,309
             
Nine Months Ended September 30, 2012           
Operating revenues$305,189$92,235$6,894$0$0$404,318
Interdepartmental revenues 387 10,721 26,032 0 (37,140) 0
Total operating revenues 305,576 102,956 32,926 0 (37,140) 404,318
Depreciation and amortization (19,554) (4,158) (5,330) 0 0 (29,042)
Other operating expenses* (244,303) (94,938) (9,154) 0 37,140 (311,255)
Operating income* 41,719 3,860 18,442 0 0 64,021
Other income, net* 729 206 0 4,045 0 4,980
Interest expense, net (7,727) (2,179) (4,915) 0 0 (14,821)
Net income 34,721 1,887 13,527 4,045 0 54,180
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (18,305) (18,305)
Net income attributable to MGE$34,721$1,887$13,527$4,045$(18,305)$35,875
             
*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:                 
September 30, 2013$948,030$274,896$50,963 $289,808$63,666$408,340$(391,992)$1,643,711
December 31, 2012 888,444 285,468 18,559  323,216 61,064 413,291 (403,118) 1,586,924
Capital Expenditures:                 
Nine Months Ended September 30, 2013$79,637$9,423$0 $3,032$0$0$0$92,092
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:               
September 30, 2013$948,030$274,896$50,963 $289,758$63,666$(9,881)$1,617,432
December 31, 2012 888,444 285,468 18,559  323,166 61,064 (23,050) 1,553,651
Capital Expenditures:               
Nine Months Ended September 30, 2013$79,637$9,423$0 $3,032$0$0$92,092
Year ended Dec. 31, 2012 81,965 13,812 0  2,658 0 0 98,435