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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Tables)
12 Months Ended
Dec. 31, 2017
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
The following table reflects goodwill allocated to each reporting segment at December 31, 2017 and 2016:

 
Electricity
 
Gas
 
Water
 
Total Company
 
(in thousands)
Goodwill balance at January 1, 2016
 
 
 
 
 
 
 
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

 
 
 
 
 
 
 
 
Goodwill acquired
59,675

 

 

 
59,675

Effect of change in exchange rates
3,193

 
32,790

 
7,610

 
43,593

 
 
 
 
 
 
 
 
Goodwill balance at December 31, 2017
 
 
 
 
 
 
 
Goodwill before impairment
500,625

 
352,703

 
378,901

 
1,232,229

Accumulated impairment losses
(386,384
)
 

 
(290,083
)
 
(676,467
)
Goodwill, net
$
114,241

 
$
352,703

 
$
88,818

 
$
555,762