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Restructuring Expected Cost, Costs Recognized, and Costs to be Recognized - 2016 Projects (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Costs incurred and charged to expense |  |  | $ 49,090 | $ (7,263) | $ 49,482
2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | $ 67,794 |  | 67,794 |  |
Costs incurred and charged to expense | 7,800 | $ 40,000 | 47,794 |  |
Restructuring and Related Cost, Expected Cost Remaining | 20,000 |  | 20,000 |  |
Employee Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Costs incurred and charged to expense |  |  | 39,943 |  |
Employee Severance [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 44,186 |  | 44,186 |  |
Costs incurred and charged to expense |  |  | 39,686 |  |
Restructuring and Related Cost, Expected Cost Remaining | 4,500 |  | 4,500 |  |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Costs incurred and charged to expense |  |  | 7,188 |  |
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 | 7,219 |  | 7,219 |  |
Costs incurred and charged to expense |  |  | 7,219 |  |
Restructuring and Related Cost, Expected Cost Remaining | 0 |  | 0 |  |
Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Costs incurred and charged to expense |  |  | 1,959 |  |
Other Restructuring [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 16,389 |  | 16,389 |  |
Costs incurred and charged to expense |  |  | 889 |  |
Restructuring and Related Cost, Expected Cost Remaining | 15,500 |  | 15,500 |  |
Electricity Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 10,827 |  | 10,827 |  |
Costs incurred and charged to expense |  |  | 8,827 |  |
Restructuring and Related Cost, Expected Cost Remaining | 2,000 |  | 2,000 |  |
Gas Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 34,468 |  | 34,468 |  |
Costs incurred and charged to expense |  |  | 23,968 |  |
Restructuring and Related Cost, Expected Cost Remaining | 10,500 |  | 10,500 |  |
Water Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 20,061 |  | 20,061 |  |
Costs incurred and charged to expense |  |  | 13,061 |  |
Restructuring and Related Cost, Expected Cost Remaining | 7,000 |  | 7,000 |  |
Corporate, Non-Segment [Member] | 2016 Projects [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 2,438 |  | 2,438 |  |
Costs incurred and charged to expense |  |  | 1,938 |  |
Restructuring and Related Cost, Expected Cost Remaining | $ 500 |  | $ 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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