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Restructuring Expected Costs - 2016 Projects (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring | $ 87,865 | $ 3,052 |
2016 Projects [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 59,584 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | $ 54,212
Restructuring | (128) |  |
Remaining Costs to be Recognized at Period End | 5,500 |  |
Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring | 86,986 |  |
Employee Severance [Member] | 2016 Projects [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 38,848 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 39,855
Restructuring | (1,007) |  |
Remaining Costs to be Recognized at Period End | 0 |  |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring | 47 |  |
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 | 4,969 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 4,922
Restructuring | 47 |  |
Remaining Costs to be Recognized at Period End | 0 |  |
Other Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring | 832 |  |
Other Restructuring [Member] | 2016 Projects [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 15,767 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 9,435
Restructuring | 832 |  |
Remaining Costs to be Recognized at Period End | 5,500 |  |
Electricity Operating Segment [Member] | 2016 Projects [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 10,919 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 9,025
Restructuring | 394 |  |
Remaining Costs to be Recognized at Period End | 1,500 |  |
Gas Operating Segment [Member] | 2016 Projects [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 31,799 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 29,181
Restructuring | 618 |  |
Remaining Costs to be Recognized at Period End | 2,000 |  |
Water Operating Segment [Member] | 2016 Projects [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 14,763 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 13,761
Restructuring | (998) |  |
Remaining Costs to be Recognized at Period End | 2,000 |  |
Corporate, Non-Segment [Member] | 2016 Projects [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 2,103 |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | $ 2,245
Restructuring | (142) |  |
Remaining Costs to be Recognized at Period End | $ 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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