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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |  |
Goodwill beginning balance | $ 468,122 | $ 500,820 |
Goodwill acquired |  | 4,684 |
Effect of change in exchange rates | (15,628) | (37,382) |
Goodwill before impairment | 1,054,717 | 1,096,660 | $ 1,191,808
Accumulated impairment losses | (602,223) | (628,538) | (690,988)
Goodwill ending balance | 452,494 | 468,122 |
Electricity Operating Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill beginning balance | 52,733 | 55,687 |
Goodwill acquired |  | 0 |
Effect of change in exchange rates | (1,360) | (2,954) |
Goodwill before impairment | 400,299 | 414,910 | 449,668
Accumulated impairment losses | (348,926) | (362,177) | (393,981)
Goodwill ending balance | 51,373 | 52,733 |
Gas Operating Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill beginning balance | 331,436 | 359,485 |
Goodwill acquired |  | 0 |
Effect of change in exchange rates | (11,523) | (28,049) |
Goodwill before impairment | 319,913 | 331,436 | 359,485
Accumulated impairment losses | 0 | 0 | 0
Goodwill ending balance | 319,913 | 331,436 |
Water Operating Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill beginning balance | 83,953 | 85,648 |
Goodwill acquired |  | 4,684 |
Effect of change in exchange rates | (2,745) | (6,379) |
Goodwill before impairment | 334,505 | 350,314 | 382,655
Accumulated impairment losses | (253,297) | (266,361) | $ (297,007)
Goodwill ending balance | $ 81,208 | $ 83,953 |

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