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Pension Plans and Other Postretirement Benefits (Details-1) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined contribution plans [Abstract] |  |  |  |  |
Defined contribution costs |  | $ 4,400,000 |  | $ 3,900,000 | $ 3,500,000
Change in plan assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year |  | 366,301,000 |  |  |
Fair value of plan assets at end of year |  | 434,922,000 |  | 366,301,000 |
Amounts recognized in the consolidated balance sheets to reflect funded status of plans [Abstract] |  |  |  |  |
Long-term asset |  | 13,630,000 |  | 0 |
Long-term liability |  | (68,665,000) |  | (67,483,000) |
Pension Benefits [Member] |  |  |  |  |
Change in benefit obligations [Roll Forward] |  |  |  |  |
Net benefit obligation at beginning of year |  | 360,288,000 |  | 391,269,000 |
Service cost |  | 4,692,000 | [1] | 5,723,000 | 5,383,000
Interest cost |  | 14,302,000 | [1] | 12,859,000 | 12,625,000
Plan participants' contributions |  | 0 |  | 0 |
Actuarial loss (gain) | [2] | 47,671,000 |  | (34,439,000) |
Gross benefits paid |  | (16,302,000) |  | (15,124,000) |
Less: federal subsidy on benefits paid |  | 0 |  | 0 |
Benefit obligation at end of year |  | 410,651,000 |  | 360,288,000 | 391,269,000
Change in plan assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year |  | 323,780,000 |  | 361,651,000 |
Actual return on plan assets |  | 76,766,000 |  | (24,485,000) |
Employer contributions |  | 1,789,000 |  | 1,738,000 |
Plan participants' contributions |  | 0 |  | 0 |
Gross benefits paid |  | (16,302,000) |  | (15,124,000) |
Fair value of plan assets at end of year |  | 386,033,000 |  | 323,780,000 | 361,651,000
Funded Status at December 31 |  | (24,618,000) |  | (36,508,000) |
Accumulated benefit obligation |  | 383,000,000.0 |  | 335,800,000 |
Amounts recognized in the consolidated balance sheets to reflect funded status of plans [Abstract] |  |  |  |  |
Long-term asset |  | 13,630,000 |  | 0 |
Current liability |  | (1,688,000) |  | (1,732,000) |
Long-term liability |  | (36,560,000) |  | (34,776,000) |
Net liability |  | (24,618,000) |  | (36,508,000) |
Amounts recognized in the consolidated balance sheets as regulatory asset [Abstract] |  |  |  |  |
Net actuarial loss |  | 79,290,000 |  | 92,978,000 |
Prior service (credit) cost |  | (268,000) |  | (385,000) |
Transition obligation |  | 0 |  | 0 |
Total |  | 79,022,000 |  | 92,593,000 |
Projected benefit obligation in excess of plan assets [Abstract] |  |  |  |  |
Projected benefit obligation with projected benefit obligation in excess of plan assets, end of year |  | 38,247,000 |  | 360,288,000 |
Fair value of plan assets with projected benefit obligation in excess of plan assets, end of year |  | 0 |  | 323,780,000 |
Accumulated benefit obligation in excess of plan assets [Abstract] |  |  |  |  |
Accumulated benefit obligation with accumulated benefit obligation in excess of plan assets, end of year |  | 35,798,000 |  | 31,200,000 |
Fair value of plan assets with accumulated benefit obligation in excess of plan assets, end of year |  | 0 |  | 0 |
Postretirement Benefits [Member] |  |  |  |  |
Change in benefit obligations [Roll Forward] |  |  |  |  |
Net benefit obligation at beginning of year |  | 75,161,000 |  | 82,290,000 |
Service cost |  | 1,110,000 | [1] | 1,283,000 | 1,231,000
Interest cost |  | 2,893,000 | [1] | 2,612,000 | 2,666,000
Plan participants' contributions |  | 969,000 |  | 950,000 |
Actuarial loss (gain) | [2] | 5,045,000 |  | (7,555,000) |
Gross benefits paid |  | (4,497,000) |  | (4,623,000) |
Less: federal subsidy on benefits paid | [3] | 220,000 |  | 204,000 |
Benefit obligation at end of year |  | 80,901,000 |  | 75,161,000 | 82,290,000
Change in plan assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year |  | 42,521,000 |  | 48,470,000 |
Actual return on plan assets |  | 9,277,000 |  | (2,780,000) |
Employer contributions |  | 619,000 |  | 504,000 |
Plan participants' contributions |  | 969,000 |  | 950,000 |
Gross benefits paid |  | (4,497,000) |  | (4,623,000) |
Fair value of plan assets at end of year |  | 48,889,000 |  | 42,521,000 | $ 48,470,000
Funded Status at December 31 |  | (32,012,000) |  | (32,640,000) |
Medicare subsidy due to MGE |  | 200,000 |  | 200,000 |
Amounts recognized in the consolidated balance sheets to reflect funded status of plans [Abstract] |  |  |  |  |
Long-term asset |  | 0 |  | 0 |
Current liability |  | 0 |  | 0 |
Long-term liability |  | (32,012,000) |  | (32,640,000) |
Net liability |  | (32,012,000) |  | (32,640,000) |
Amounts recognized in the consolidated balance sheets as regulatory asset [Abstract] |  |  |  |  |
Net actuarial loss |  | 8,659,000 |  | 10,569,000 |
Prior service (credit) cost |  | (4,484,000) |  | (7,153,000) |
Transition obligation |  | 17,000 |  | 21,000 |
Total |  | $ 4,192,000 |  | $ 3,437,000 |
[1] | MGE has deferred approximately $6.2 million of pension and other postretirement costs. The impact of the deferral has not been reflected in the table above. See Footnote 8 for further information.
[2] | In 2019, lower discount rates were the main driver of the actuarial loss. However, in 2018, higher discount rates were the main driver of the actuarial gain.
[3] | In 2003, the Medicare Prescription Drug, Improvement and Modernization Act of 2003 was signed into law authorizing Medicare to provide prescription drug benefits to retirees. For the years ended December 31, 2019 and 2018, the subsidy due to MGE was $0.2 million.

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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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