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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Details) - USD ($) $ in Thousands | 7 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |  |
Goodwill beginning balance |  | $ 452,494 | $ 468,122 |
Goodwill acquired | $ 59,675 | 59,675 |  |
Effect of change in exchange rates |  | 43,593 | (15,628) |
Goodwill before impairment | 1,232,229 | 1,232,229 | 1,054,717 | $ 1,096,660
Accumulated impairment losses | (676,467) | (676,467) | (602,223) | (628,538)
Goodwill ending balance | 555,762 | 555,762 | 452,494 |
Electricity Operating Segment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill beginning balance |  | 51,373 | 52,733 |
Goodwill acquired |  | 59,675 |  |
Effect of change in exchange rates |  | 3,193 | (1,360) |
Goodwill before impairment | 500,625 | 500,625 | 400,299 | 414,910
Accumulated impairment losses | (386,384) | (386,384) | (348,926) | (362,177)
Goodwill ending balance | 114,241 | 114,241 | 51,373 |
Gas Operating Segment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill beginning balance |  | 319,913 | 331,436 |
Goodwill acquired |  | 0 |  |
Effect of change in exchange rates |  | 32,790 | (11,523) |
Goodwill before impairment | 352,703 | 352,703 | 319,913 | 331,436
Accumulated impairment losses | 0 | 0 | 0 | 0
Goodwill ending balance | 352,703 | 352,703 | 319,913 |
Water Operating Segment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill beginning balance |  | 81,208 | 83,953 |
Goodwill acquired |  | 0 |  |
Effect of change in exchange rates |  | 7,610 | (2,745) |
Goodwill before impairment | 378,901 | 378,901 | 334,505 | 350,314
Accumulated impairment losses | (290,083) | (290,083) | (253,297) | $ (266,361)
Goodwill ending balance | $ 88,818 | $ 88,818 | $ 81,208 |

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