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Schedule of Goodwill Allocated to Reporting Segments (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Goodwill [Roll Forward] |  |
Goodwill before impairment, at beginning of period | $ 1,232,229 |
Accumulated impairment losses, at beginning of period | (676,467) |
Goodwill, net, at beginning of period | 555,762 |
Goodwill acquired | 570,790 |
Effect of change in exchange rates | (4,657) |
Goodwill before impairment, at end of period | 1,791,125 |
Accumulated impairment losses, at end of period | (669,230) |
Goodwill, net, at end of period | 555,762 | $ 1,121,895
Electricity Operating Segment [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill before impairment, at beginning of period | 500,625 |
Accumulated impairment losses, at beginning of period | (386,384) |
Goodwill, net, at beginning of period | 114,241 |
Goodwill acquired | 0 |
Effect of change in exchange rates | (370) |
Goodwill before impairment, at end of period | 496,565 |
Accumulated impairment losses, at end of period | (382,694) |
Goodwill, net, at end of period | 114,241 | 113,871
Gas Operating Segment [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill before impairment, at beginning of period | 352,703 |
Accumulated impairment losses, at beginning of period | 0 |
Goodwill, net, at beginning of period | 352,703 |
Goodwill acquired | 0 |
Effect of change in exchange rates | (3,259) |
Goodwill before impairment, at end of period | 349,444 |
Accumulated impairment losses, at end of period | 0 |
Goodwill, net, at end of period | 352,703 | 349,444
Water Operating Segment [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill before impairment, at beginning of period | 378,901 |
Accumulated impairment losses, at beginning of period | (290,083) |
Goodwill, net, at beginning of period | 88,818 |
Goodwill acquired | 0 |
Effect of change in exchange rates | (785) |
Goodwill before impairment, at end of period | 374,569 |
Accumulated impairment losses, at end of period | (286,536) |
Goodwill, net, at end of period | 88,818 | 88,033
Networks Operating Segment [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill before impairment, at beginning of period | 0 |
Accumulated impairment losses, at beginning of period | 0 |
Goodwill, net, at beginning of period | 0 |
Goodwill acquired | 570,790 |
Effect of change in exchange rates | (243) |
Goodwill before impairment, at end of period | 570,547 |
Accumulated impairment losses, at end of period | 0 |
Goodwill, net, at end of period | $ 0 | $ 570,547

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