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Restructuring Expected Costs - 2016 Projects (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring | $ 666 | $ (678) | $ 82,908 | $ 7,417 |
2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 58,636 |  | 58,636 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | $ 54,212
Restructuring |  |  | (156) |  |
Remaining Costs to be Recognized at Period End | 4,580 |  | 4,580 |  |
Employee Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | 79,011 |  |
Employee Severance [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 37,197 |  | 37,197 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 39,855
Restructuring |  |  | (2,658) |  |
Remaining Costs to be Recognized at Period End | 0 |  | 0 |  |
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] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 5,375 |  | 5,375 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 4,922
Restructuring |  |  | 453 |  |
Remaining Costs to be Recognized at Period End | 0 |  | 0 |  |
Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | 3,329 |  |
Other Restructuring [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 16,064 |  | 16,064 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 9,435
Restructuring |  |  | 2,049 |  |
Remaining Costs to be Recognized at Period End | 4,580 |  | 4,580 |  |
Electricity Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 11,029 |  | 11,029 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 9,025
Restructuring |  |  | 696 |  |
Remaining Costs to be Recognized at Period End | 1,308 |  | 1,308 |  |
Gas Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 30,287 |  | 30,287 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 29,181
Restructuring |  |  | (791) |  |
Remaining Costs to be Recognized at Period End | 1,897 |  | 1,897 |  |
Water Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 14,678 |  | 14,678 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 13,761
Restructuring |  |  | (302) |  |
Remaining Costs to be Recognized at Period End | 1,219 |  | 1,219 |  |
Corporate, Non-Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 2,642 |  | 2,642 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | $ 2,245
Restructuring |  |  | 241 |  |
Remaining Costs to be Recognized at Period End | $ 156 |  | $ 156 |  |

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- Definition Amount of costs incurred to date 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 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: 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 3: 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 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(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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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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