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Restructuring Expected Costs - 2016 Projects (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring | $ (678) | $ 40,679 | $ 7,417 | $ 41,294 |
2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 63,211 |  | 63,211 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | $ 47,794
Restructuring |  |  | 7,417 |  |
Remaining Costs to be Recognized at Period End | 8,000 |  | 8,000 |  |
Employee Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | 4,832 |  |
Employee Severance [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 44,518 |  | 44,518 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 39,686
Restructuring |  |  | 4,832 |  |
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 |  |  | (720) |  |
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 | 6,499 |  | 6,499 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 7,219
Restructuring |  |  | (720) |  |
Remaining Costs to be Recognized at Period End | 0 |  | 0 |  |
Other restructuring costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | 3,305 |  |
Other restructuring costs | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 12,194 |  | 12,194 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 889
Restructuring |  |  | 3,305 |  |
Remaining Costs to be Recognized at Period End | 8,000 |  | 8,000 |  |
Electricity Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 11,884 |  | 11,884 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 8,827
Restructuring |  |  | 1,557 |  |
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 | 32,185 |  | 32,185 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 23,968
Restructuring |  |  | 4,717 |  |
Remaining Costs to be Recognized at Period End | 3,500 |  | 3,500 |  |
Water Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 16,007 |  | 16,007 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 13,061
Restructuring |  |  | 446 |  |
Remaining Costs to be Recognized at Period End | 2,500 |  | 2,500 |  |
Corporate, Non-Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 3,135 |  | 3,135 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | $ 1,938
Restructuring |  |  | 697 |  |
Remaining Costs to be Recognized at Period End | $ 500 |  | $ 500 |  |

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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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