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Restructuring Expected Costs - 2016 Projects (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring | $ 5,043 | $ (1,622) | $ 8,095 | $ 615 |
2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 67,889 |  | 67,889 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | $ 47,794
Restructuring |  |  | 8,095 |  |
Remaining Costs to be Recognized at Period End | 12,000 |  | 12,000 |  |
Employee Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | 5,507 |  |
Employee Severance [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 45,193 |  | 45,193 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 39,686
Restructuring |  |  | 5,507 |  |
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 |  |  | 80 |  |
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 | 7,299 |  | 7,299 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 7,219
Restructuring |  |  | 80 |  |
Remaining Costs to be Recognized at Period End | 0 |  | 0 |  |
Other restructuring costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | 2,508 |  |
Other restructuring costs | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 15,397 |  | 15,397 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 889
Restructuring |  |  | 2,508 |  |
Remaining Costs to be Recognized at Period End | 12,000 |  | 12,000 |  |
Electricity Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 11,157 |  | 11,157 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 8,827
Restructuring |  |  | 330 |  |
Remaining Costs to be Recognized at Period End | 2,000 |  | 2,000 |  |
Gas Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 32,891 |  | 32,891 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 23,968
Restructuring |  |  | 5,423 |  |
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 | 21,074 |  | 21,074 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | 13,061
Restructuring |  |  | 2,013 |  |
Remaining Costs to be Recognized at Period End | 6,000 |  | 6,000 |  |
Corporate, Non-Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 2,767 |  | 2,767 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  |  |  | $ 1,938
Restructuring |  |  | 329 |  |
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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