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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Segment Information

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

(In thousands)MGE EnergyElectricGasNon-regulated EnergyTransmission InvestmentAll OthersConsolidation/ Elimination EntriesConsolidated Total
Three Months Ended March 31, 2018
Operating revenues$94,391$62,765$476$-$-$-$157,632
Interdepartmental revenues314,3479,820--(14,198)-
Total operating revenues94,42267,11210,296--(14,198)157,632
Depreciation and amortization(9,378)(2,395)(1,850)---(13,623)
Other operating expenses(76,575)(55,195)(43)(3)(203)14,198(117,821)
Operating income (loss)8,4699,5228,403(3)(203)-26,188
Other income, net1,730766-2,37251-4,919
Interest (expense) income, net(2,867)(839)(1,348)-315-(4,739)
Income before taxes7,3329,4497,0552,369163-26,368
Income tax provision(1,200)(2,458)(1,922)(648)(139)-(6,367)
Net income$6,132$6,991$5,133$1,721$24$-$20,001
Three Months Ended March 31, 2017
Operating revenues$98,324$58,426$73$-$-$-$156,823
Interdepartmental revenues(105)4,39411,070--(15,359)-
Total operating revenues98,21962,82011,143--(15,359)156,823
Depreciation and amortization(8,900)(2,213)(1,846)---(12,959)
Other operating expenses(a)(76,006)(50,971)(41)-(369)15,359(112,028)
Operating income (loss)13,3139,6369,256-(369)-31,836
Other income (deductions), net(a)870399-2,478(222)-3,525
Interest (expense) income, net(2,776)(799)(1,407)-88-(4,894)
Income (loss) before taxes11,4079,2367,8492,478(503)-30,467
Income tax (provision) benefit(3,454)(3,704)(3,151)(997)139-(11,167)
Net income (loss)$7,953$5,532$4,698$1,481$(364)$-$19,300
(a) Reflects retrospective application of new accounting pronouncement related to pension and other postretirement benefits, see Footnote 2 for further information.

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

(In thousands)MGEElectricGasNon-regulated EnergyConsolidation/ Elimination EntriesConsolidated Total
Three Months Ended March 31, 2018
Operating revenues$94,391$62,765$476$-$157,632
Interdepartmental revenues314,3479,820(14,198)-
Total operating revenues94,42267,11210,296(14,198)157,632
Depreciation and amortization(9,378)(2,395)(1,850)-(13,623)
Other operating expenses(b)(77,731)(57,641)(1,965)14,198(123,139)
Operating income(b)7,3137,0766,481-20,870
Other income, net(b)1,686754--2,440
Interest expense, net(2,867)(839)(1,348)-(5,054)
Net income6,1326,9915,133-18,256
Less: Net income attributable to
noncontrolling interest, net of tax---(5,806)(5,806)
Net income attributable to MGE$6,132$6,991$5,133$(5,806)$12,450
Three Months Ended March 31, 2017
Operating revenues$98,328$58,435$73$-$156,836
Interdepartmental revenues(109)4,38511,070(15,346)-
Total operating revenues98,21962,82011,143(15,346)156,836
Depreciation and amortization(8,900)(2,213)(1,846)-(12,959)
Other operating expenses(a), (b)(79,426)(54,665)(3,192)15,346(121,937)
Operating income(b)9,8935,9426,105-21,940
Other income, net(a), (b)836389--1,225
Interest expense, net(2,776)(799)(1,407)-(4,982)
Net income7,9535,5324,698-18,183
Less: Net income attributable to
noncontrolling interest, net of tax---(5,389)(5,389)
Net income attributable to MGE$7,953$5,532$4,698$(5,389)$12,794
(a) Reflects retrospective application of new accounting pronouncement related to pension and other postretirement benefits, see Footnote 2 for further information.
(b) Amounts are shown net of the related tax expense, consistent with the presentation on the MGE Consolidated Statements of Income.