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Schedule of Goodwill Allocated to Reporting Segments (Tables) | 3 Months Ended
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Mar. 31, 2017
Goodwill Excluding Non Goodwill Intangibles [Abstract] |
Schedule of Goodwill [Table Text Block] | The following table reflects goodwill allocated to each reporting unit:
| Electricity |  | Gas |  | Water |  | Total Company
| (in thousands)
Balances at January 1, 2017 |  |  |  |  |  |  |
Goodwill before impairment | $ | 400,299 |  |  | $ | 319,913 |  |  | $ | 334,505 |  |  | $ | 1,054,717 |
Accumulated impairment losses | (348,926 | ) |  | — |  |  | (253,297 | ) |  | (602,223 | )
Goodwill, net | 51,373 |  |  | 319,913 |  |  | 81,208 |  |  | 452,494 |
Effect of change in exchange rates | 776 |  |  | 7,774 |  |  | 1,862 |  |  | 10,412 |
Balances at March 31, 2017 |  |  |  |  |  |  |
Goodwill before impairment | 409,960 |  |  | 327,687 |  |  | 345,042 |  |  | 1,082,689 |
Accumulated impairment losses | (357,811 | ) |  | — |  |  | (261,972 | ) |  | (619,783 | )
Goodwill, net | $ | 52,149 |  |  | $ | 327,687 |  |  | $ | 83,070 |  |  | $ | 462,906 |

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- Definition Goodwill, excluding non-goodwill intangible assets [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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