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Goodwill (Text Block) | 12 Months Ended
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Dec. 31, 2017
Goodwill Excluding Non Goodwill Intangibles [Abstract] |
Goodwill Disclosure [Text Block] | Goodwill The following table reflects goodwill allocated to each reporting segment at December 31, 2017 and 2016:
| Electricity |  | Gas |  | Water |  | Total Company
| (in thousands)
Goodwill balance at January 1, 2016 |  |  |  |  |  |  |
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 |
Goodwill acquired | 59,675 |  |  | — |  |  | — |  |  | 59,675 |
Effect of change in exchange rates | 3,193 |  |  | 32,790 |  |  | 7,610 |  |  | 43,593 |
Goodwill balance at December 31, 2017 |  |  |  |  |  |  |
Goodwill before impairment | 500,625 |  |  | 352,703 |  |  | 378,901 |  |  | 1,232,229 |
Accumulated impairment losses | (386,384 | ) |  | — |  |  | (290,083 | ) |  | (676,467 | )
Goodwill, net | $ | 114,241 |  |  | $ | 352,703 |  |  | $ | 88,818 |  |  | $ | 555,762 |
During our 2017 annual goodwill impairment test, performed as of October 1, 2017, we performed a qualitative assessment and determined it is not more likely than not that the fair value of our reporting units is less than their carrying amounts.

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- Definition Goodwill, excluding non-goodwill intangible assets [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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