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Schedule of Goodwill Allocated to Reporting Segments (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 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 | 60,286 |
Effect of change in exchange rates | 28,291 |
Goodwill before impairment, at end of period | 1,191,090 |
Accumulated impairment losses, at end of period | (650,019) |
Goodwill, net, at end of period | 452,494 | $ 541,071
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 | 60,286 |
Effect of change in exchange rates | 2,065 |
Goodwill before impairment, at end of period | 486,834 |
Accumulated impairment losses, at end of period | (373,110) |
Goodwill, net, at end of period | 51,373 | 113,724
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 | 21,158 |
Goodwill before impairment, at end of period | 341,071 |
Accumulated impairment losses, at end of period | 0 |
Goodwill, net, at end of period | 319,913 | 341,071
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 | 5,068 |
Goodwill before impairment, at end of period | 363,185 |
Accumulated impairment losses, at end of period | (276,909) |
Goodwill, net, at end of period | $ 81,208 | $ 86,276

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