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Restructuring Expected Costs, Cost Recognized, and Remaining Costs to be Recognized - 2014 Projects (Details) - USD ($) $ in Thousands | 12 Months Ended | 15 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | $ 49,090 | $ (7,263) | $ 49,482 |
Employee severance costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 39,943 |  |  |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 7,188 |  |  |
Other restructuring costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | 1,959 |  |  |
2014 Project [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 48,478 |  |  |
Restructuring Charges | 1,296 |  |  | $ 47,182
Restructuring and Related Cost, Expected Cost Remaining | 0 |  |  |
2014 Project [Member] | Electricity Operating Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 20,610 |  |  |
Restructuring Charges | (1,133) |  |  | 21,743
Restructuring and Related Cost, Expected Cost Remaining | 0 |  |  |
2014 Project [Member] | Gas Operating Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 13,631 |  |  |
Restructuring Charges | 1,776 |  |  | 11,855
Restructuring and Related Cost, Expected Cost Remaining | 0 |  |  |
2014 Project [Member] | Water Operating Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 1,995 |  |  |
Restructuring Charges | 55 |  |  | 1,940
Restructuring and Related Cost, Expected Cost Remaining | 0 |  |  |
2014 Project [Member] | Corporate, Non-Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 12,242 |  |  |
Restructuring Charges | 598 |  |  | 11,644
Restructuring and Related Cost, Expected Cost Remaining | 0 |  |  |
2014 Project [Member] | Employee severance costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 34,630 |  |  |
Restructuring Charges | 257 |  |  | 34,373
Restructuring and Related Cost, Expected Cost Remaining | 0 |  |  |
2014 Project [Member] | Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 8,849 |  |  |
Restructuring Charges | (31) |  |  | 8,880
Restructuring and Related Cost, Expected Cost Remaining | 0 |  |  |
2014 Project [Member] | Other restructuring costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 4,999 |  |  |
Restructuring Charges | 1,070 |  |  | $ 3,929
Restructuring and Related Cost, Expected Cost Remaining | $ 0 |  |  |

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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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