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Goodwill | 6 Months Ended
--- | ---
Jun. 30, 2018
Goodwill Excluding Non Goodwill Intangibles [Abstract] |
Goodwill | Goodwill The following table reflects goodwill allocated to each reporting unit:
| Electricity |  | Gas |  | Water |  | Networks |  | Total Company
| (in thousands)
Goodwill balance at January 1, 2018 |  |  |  |  |  |  |  |  |
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 |
Goodwill acquired | — |  |  | — |  |  | — |  |  | 572,870 |  |  | 572,870 |
Effect of change in exchange rates | (706 | ) |  | (6,669 | ) |  | (1,605 | ) |  | (243 | ) |  | (9,223 | )
Goodwill balance at June 30, 2018 |  |  |  |  |  |  |  |  |
Goodwill before impairment | 492,367 |  |  | 346,034 |  |  | 370,031 |  |  | 572,627 |  |  | 1,781,059 |
Accumulated impairment losses | (378,832 | ) |  | — |  |  | (282,818 | ) |  | — |  |  | (661,650 | )
Goodwill, net | $ | 113,535 |  |  | $ | 346,034 |  |  | $ | 87,213 |  |  | $ | 572,627 |  |  | $ | 1,119,409 |

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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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