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Schedule of Goodwill Allocated to Reporting Segments (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 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 | 572,870 |
Effect of change in exchange rates | (9,223) |
Goodwill before impairment, at end of period | 1,781,059 |
Accumulated impairment losses, at end of period | (661,650) |
Goodwill, net, at end of period | 555,762 | $ 1,119,409
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 | (706) |
Goodwill before impairment, at end of period | 492,367 |
Accumulated impairment losses, at end of period | (378,832) |
Goodwill, net, at end of period | 114,241 | 113,535
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 | (6,669) |
Goodwill before impairment, at end of period | 346,034 |
Accumulated impairment losses, at end of period | 0 |
Goodwill, net, at end of period | 352,703 | 346,034
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 | (1,605) |
Goodwill before impairment, at end of period | 370,031 |
Accumulated impairment losses, at end of period | (282,818) |
Goodwill, net, at end of period | 88,818 | 87,213
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 | 572,870 |
Effect of change in exchange rates | (243) |
Goodwill before impairment, at end of period | 572,627 |
Accumulated impairment losses, at end of period | 0 |
Goodwill, net, at end of period | $ 0 | $ 572,627

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