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Schedule of Goodwill Allocated to Reporting Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 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 |
Effect of change in exchange rates | 10,412 |
Goodwill before impairment, at end of period | 1,082,689 |
Accumulated impairment losses, at end of period | (619,783) |
Goodwill, net, at end of period | 452,494 | $ 462,906
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 |
Effect of change in exchange rates | 776 |
Goodwill before impairment, at end of period | 409,960 |
Accumulated impairment losses, at end of period | (357,811) |
Goodwill, net, at end of period | 51,373 | 52,149
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 |
Effect of change in exchange rates | 7,774 |
Goodwill before impairment, at end of period | 327,687 |
Accumulated impairment losses, at end of period | 0 |
Goodwill, net, at end of period | 319,913 | 327,687
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 |
Effect of change in exchange rates | 1,862 |
Goodwill before impairment, at end of period | 345,042 |
Accumulated impairment losses, at end of period | (261,972) |
Goodwill, net, at end of period | $ 81,208 | $ 83,070

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