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Restructuring Expected Costs - 2016 Projects (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring | $ (5,623) | $ 5,043 | $ 82,242 | $ 8,095 |
2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 59,367 |  | 59,367 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | $ 54,212
Restructuring |  |  | 155 |  |
Remaining Costs to be Recognized at Period End | 5,000 |  | 5,000 |  |
Employee Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | 79,660 |  |
Employee Severance [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 37,846 |  | 37,846 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 39,855
Restructuring |  |  | (2,009) |  |
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 |  |  | 624 |  |
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 | 5,546 |  | 5,546 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 4,922
Restructuring |  |  | 624 |  |
Remaining Costs to be Recognized at Period End | 0 |  | 0 |  |
Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | 1,958 |  |
Other Restructuring [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 15,975 |  | 15,975 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 9,435
Restructuring |  |  | 1,540 |  |
Remaining Costs to be Recognized at Period End | 5,000 |  | 5,000 |  |
Electricity Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 11,234 |  | 11,234 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 9,025
Restructuring |  |  | 709 |  |
Remaining Costs to be Recognized at Period End | 1,500 |  | 1,500 |  |
Gas Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 31,084 |  | 31,084 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 29,181
Restructuring |  |  | (97) |  |
Remaining Costs to be Recognized at Period End | 2,000 |  | 2,000 |  |
Water Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 14,562 |  | 14,562 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 13,761
Restructuring |  |  | (699) |  |
Remaining Costs to be Recognized at Period End | 1,500 |  | 1,500 |  |
Corporate, Non-Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 2,487 |  | 2,487 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | $ 2,245
Restructuring |  |  | 242 |  |
Remaining Costs to be Recognized at Period End | $ 0 |  | $ 0 |  |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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