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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
The following table reflects goodwill allocated to each reporting segment at December 31, 2016 and 2015:

 
Electricity
 
Gas
 
Water
 
Total Company
 
(in thousands)
Goodwill balance at January 1, 2015
 
 
 
 
 
 
 
Goodwill before impairment
$
449,668

 
$
359,485

 
$
382,655

 
$
1,191,808

Accumulated impairment losses
(393,981
)
 
—

 
(297,007
)
 
(690,988
)
Goodwill, net
55,687

 
359,485

 
85,648

 
500,820

 
 
 
 
 
 
 
 
Goodwill acquired
—

 
—

 
4,684

 
4,684

Effect of change in exchange rates
(2,954
)
 
(28,049
)
 
(6,379
)
 
(37,382
)
 
 
 
 
 
 
 
 
Goodwill balance at December 31, 2015
 
 
 
 
 
 
 
Goodwill before impairment
414,910

 
331,436

 
350,314

 
1,096,660

Accumulated impairment losses
(362,177
)
 
—

 
(266,361
)
 
(628,538
)
Goodwill, net
52,733

 
331,436

 
83,953

 
468,122

 
 
 
 
 
 
 
 
Effect of change in exchange rates
(1,360
)
 
(11,523
)
 
(2,745
)
 
(15,628
)
 
 
 
 
 
 
 
 
Goodwill balance at December 31, 2016
 
 
 
 
 
 
 
Goodwill before impairment
400,299

 
319,913

 
334,505

 
1,054,717

Accumulated impairment losses
(348,926
)
 
—

 
(253,297
)
 
(602,223
)
Goodwill, net
$
51,373

 
$
319,913

 
$
81,208

 
$
452,494