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Schedule of Goodwill Allocated to Reporting Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 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 | 572,499 |
Effect of change in exchange rates | 14,496 |
Goodwill before impairment, at end of period | 1,843,857 |
Accumulated impairment losses, at end of period | (701,100) |
Goodwill, net, at end of period | 555,762 | $ 1,142,757
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 | 1,031 |
Goodwill before impairment, at end of period | 514,057 |
Accumulated impairment losses, at end of period | (398,785) |
Goodwill, net, at end of period | 114,241 | 115,272
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 | 10,788 |
Goodwill before impairment, at end of period | 363,491 |
Accumulated impairment losses, at end of period | 0 |
Goodwill, net, at end of period | 352,703 | 363,491
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 | 2,560 |
Goodwill before impairment, at end of period | 393,693 |
Accumulated impairment losses, at end of period | (302,315) |
Goodwill, net, at end of period | 88,818 | 91,378
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 | 572,499 |
Effect of change in exchange rates | 117 |
Goodwill before impairment, at end of period | 572,616 |
Accumulated impairment losses, at end of period | 0 |
Goodwill, net, at end of period | $ 0 | $ 572,616

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