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Restructuring Expected Cost, Costs Recognized, and Costs to be Recognized - 2016 Projects (Details) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Costs incurred and charged to expense |  |  |  | $ 6,418 | $ 49,090 | $ (7,263) |
2016 Projects [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  | 60,212 |  |  |
Costs incurred and charged to expense | $ 7,800 | $ 40,000 | $ 47,794 | 6,418 |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | 6,000 |  |  |
2014 Project [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Costs incurred and charged to expense |  |  |  |  |  |  | $ 48,500
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | 0 |  |  |
Employee Severance [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Costs incurred and charged to expense |  |  |  | 169 |  |  |
Employee Severance [Member] | 2016 Projects [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  | 39,855 |  |  |
Costs incurred and charged to expense |  |  | 39,686 | 169 |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | 0 |  |  |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Costs incurred and charged to expense |  |  |  | (2,297) |  |  |
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 |  |  |  | 4,922 |  |  |
Costs incurred and charged to expense |  |  | 7,219 | (2,297) |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | 0 |  |  |
Other Restructuring [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Costs incurred and charged to expense |  |  |  | 8,546 |  |  |
Other Restructuring [Member] | 2016 Projects [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  | 15,435 |  |  |
Costs incurred and charged to expense |  |  | 889 | 8,546 |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | 6,000 |  |  |
Electricity Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  | 10,525 |  |  |
Costs incurred and charged to expense |  |  | 8,827 | 198 |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | 1,500 |  |  |
Gas Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  | 31,181 |  |  |
Costs incurred and charged to expense |  |  | 23,968 | 5,213 |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | 2,000 |  |  |
Water Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  | 15,761 |  |  |
Costs incurred and charged to expense |  |  | 13,061 | 700 |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | 2,000 |  |  |
Corporate, Non-Segment [Member] | 2016 Projects [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  | 2,745 |  |  |
Costs incurred and charged to expense |  |  | $ 1,938 | 307 |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | $ 500 |  |  |

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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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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: 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 4: 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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