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Restructuring Restructuring Expected Costs - 2018 Projects (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring | $ 666 | $ (678) | $ 82,908 | $ 7,417
2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 101,140 |  | 101,140 |
Restructuring |  |  | 83,064 |
Restructuring and Related Cost, Expected Cost Remaining | 18,076 |  | 18,076 |
Employee Severance [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring |  |  | 79,011 |
Employee Severance [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 81,669 |  | 81,669 |
Restructuring |  |  | 81,669 |
Restructuring and Related Cost, Expected Cost Remaining | 0 |  | 0 |
Other Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring |  |  | 3,329 |
Other Restructuring [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 19,356 |  | 19,356 |
Restructuring |  |  | 1,280 |
Restructuring and Related Cost, Expected Cost Remaining | 18,076 |  | 18,076 |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring |  |  | 568 |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 115 |  | 115 |
Restructuring |  |  | 115 |
Restructuring and Related Cost, Expected Cost Remaining | 0 |  | 0 |
Electricity Operating Segment [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 20,609 |  | 20,609 |
Restructuring |  |  | 19,109 |
Restructuring and Related Cost, Expected Cost Remaining | 1,500 |  | 1,500 |
Gas Operating Segment [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 52,289 |  | 52,289 |
Restructuring |  |  | 41,583 |
Restructuring and Related Cost, Expected Cost Remaining | 10,706 |  | 10,706 |
Water Operating Segment [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 21,804 |  | 21,804 |
Restructuring |  |  | 15,934 |
Restructuring and Related Cost, Expected Cost Remaining | 5,870 |  | 5,870 |
Corporate, Non-Segment [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 6,438 |  | 6,438 |
Restructuring |  |  | 6,438 |
Restructuring and Related Cost, Expected Cost Remaining | $ 0 |  | $ 0 |

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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