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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill [Line Items] |
Schedule of Goodwill [Table Text Block] | The following table reflects goodwill allocated to each reporting segment at December 31, 2016 and 2015:
| Electricity |  | Gas |  | Water |  | Total Company
| (in thousands)
Goodwill balance at January 1, 2015 |  |  |  |  |  |  |
Goodwill before impairment | $ | 449,668 |  |  | $ | 359,485 |  |  | $ | 382,655 |  |  | $ | 1,191,808 |
Accumulated impairment losses | (393,981 | ) |  | — |  |  | (297,007 | ) |  | (690,988 | )
Goodwill, net | 55,687 |  |  | 359,485 |  |  | 85,648 |  |  | 500,820 |
Goodwill acquired | — |  |  | — |  |  | 4,684 |  |  | 4,684 |
Effect of change in exchange rates | (2,954 | ) |  | (28,049 | ) |  | (6,379 | ) |  | (37,382 | )
Goodwill balance at December 31, 2015 |  |  |  |  |  |  |
Goodwill before impairment | 414,910 |  |  | 331,436 |  |  | 350,314 |  |  | 1,096,660 |
Accumulated impairment losses | (362,177 | ) |  | — |  |  | (266,361 | ) |  | (628,538 | )
Goodwill, net | 52,733 |  |  | 331,436 |  |  | 83,953 |  |  | 468,122 |
Effect of change in exchange rates | (1,360 | ) |  | (11,523 | ) |  | (2,745 | ) |  | (15,628 | )
Goodwill balance at December 31, 2016 |  |  |  |  |  |  |
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 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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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