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Schedule of Goodwill Allocated to Reporting Segments (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017
Goodwill [Roll Forward] |  |
Goodwill before impairment, at beginning of period | $ 1,054,717 |
Accumulated impairment losses, at beginning of period | (602,223) |
Goodwill, net, at beginning of period | 452,494 |
Goodwill acquired | 59,137 |
Effect of change in exchange rates | 39,101 |
Goodwill before impairment, at end of period | 1,219,302 |
Accumulated impairment losses, at end of period | (668,570) |
Goodwill, net, at end of period | 452,494 | $ 550,732
Electricity Operating Segment [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill before impairment, at beginning of period | 400,299 |
Accumulated impairment losses, at beginning of period | (348,926) |
Goodwill, net, at beginning of period | 51,373 |
Goodwill acquired | 59,137 |
Effect of change in exchange rates | 2,900 |
Goodwill before impairment, at end of period | 495,848 |
Accumulated impairment losses, at end of period | (382,438) |
Goodwill, net, at end of period | 51,373 | 113,410
Gas Operating Segment [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill before impairment, at beginning of period | 319,913 |
Accumulated impairment losses, at beginning of period | 0 |
Goodwill, net, at beginning of period | 319,913 |
Goodwill acquired | 0 |
Effect of change in exchange rates | 29,390 |
Goodwill before impairment, at end of period | 349,303 |
Accumulated impairment losses, at end of period | 0 |
Goodwill, net, at end of period | 319,913 | 349,303
Water Operating Segment [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill before impairment, at beginning of period | 334,505 |
Accumulated impairment losses, at beginning of period | (253,297) |
Goodwill, net, at beginning of period | 81,208 |
Goodwill acquired | 0 |
Effect of change in exchange rates | 6,811 |
Goodwill before impairment, at end of period | 374,151 |
Accumulated impairment losses, at end of period | (286,132) |
Goodwill, net, at end of period | $ 81,208 | $ 88,019

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