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Investment in ATC and ATC Holdco (Tables)
 6 Months Ended
Jun. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]  
Equity Method Investments Financial Data

MGE Transco and MGEE Transco have accounted for their investment in ATC and ATC Holdco, respectively, under the equity method of accounting. Equity earnings from investments are recorded as "Other income" on MGE Energy's consolidated statements of income. For the three and six months ended June 30, 2018 and 2017, MGE Transco recorded the following:

Three Months EndedSix Months Ended
June 30,June 30,
(In thousands)2018201720182017
Equity earnings from investment in ATC$1,990$2,486$4,441$5,094
Dividends from ATC(a)2,9592,0002,9592,000
Capital contributions to ATC1,0658881,7752,308

(a) MGE Transco recorded a $2.3 million and $2.1 million dividend receivable from ATC as of December 31, 2017 and 2016, respectively. A cash dividend was received in January of each of the proceeding years. MGE Transco recorded a $1.4 million dividend receivable from ATC as of June 30, 2018. A cash dividend was received in July 2018.

ATC's summarized financial data for the three and six months ended June 30, 2018 and 2017, is as follows:

Three Months EndedSix Months Ended
June 30,June 30,
(In thousands)2018201720182017
Operating revenues$165,506$176,610$330,935$351,279
Operating expenses(91,474)(82,974)(176,367)(165,670)
Other income, net1,5201,0881,6311,771
Interest expense, net(26,895)(26,466)(54,657)(53,250)
Earnings before members' income taxes$48,657$68,258$101,542$134,130