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Schedule of Goodwill Allocated to Reporting Segments (Tables)
 9 Months Ended
Sep. 30, 2016
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
The following table reflects goodwill allocated to each reporting unit:
 
Electricity
 
Gas
 
Water
 
Total Company
 
(in thousands)
Balances 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
329

 
5,843

 
1,411

 
7,583

 
 
 
 
 
 
 
 
Balances at September 30, 2016
 
 
 
 
 
 
 
Goodwill before impairment
421,852

 
337,279

 
358,081

 
1,117,212

Accumulated impairment losses
(368,790
)
 
—

 
(272,717
)
 
(641,507
)
Goodwill, net
$
53,062

 
$
337,279

 
$
85,364

 
$
475,705