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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
The following table reflects goodwill allocated to each reporting segment at December 31, 2014 and 2013:

 
Electricity
 
Gas
 
Water
 
Total Company
 
(in thousands)
Goodwill balance at January 1, 2013
 
 
 
 
 
 
 
Goodwill before impairment
$
475,711

 
$
383,743

 
$
414,394

 
$
1,273,848

Accumulated impairment losses
(249,502
)
 
—

 
(323,330
)
 
(572,832
)
Goodwill, net
226,209

 
383,743

 
91,064

 
701,016

 
 
 
 
 
 
 
 
Goodwill impairment
(173,249
)
 
—

 
—

 
(173,249
)
Adjustments of previous acquisitions
3,958

 
—

 
—

 
3,958

Effect of change in exchange rates
3,314

 
11,135

 
2,404

 
16,853

 
 
 
 
 
 
 
 
Goodwill balance at December 31, 2013
 
 
 
 
 
 
 
Goodwill before impairment
493,610

 
394,878

 
429,783

 
1,318,271

Accumulated impairment losses
(433,378
)
 
—

 
(336,315
)
 
(769,693
)
Goodwill, net
60,232

 
394,878

 
93,468

 
548,578

 
 
 
 
 
 
 
 
Goodwill impairment
(977
)
 
—

 
—

 
(977
)
Effect of change in exchange rates
(3,568
)
 
(35,393
)
 
(7,820
)
 
(46,781
)
 
 
 
 
 
 
 
 
Goodwill balance at December 31, 2014
 
 
 
 
 
 
 
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