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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Tables)
 3 Months Ended
Mar. 31, 2014
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
as of March 31, 2014:

 
Electricity
 
Gas
 
Water
 
Total Company
 
(in thousands)
Balance at January 1, 2014
 
 
 
 
 
 
 
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
(105
)
 
(852
)
 
(207
)
 
(1,164
)
 
 
 
 
 
 
 
 
Balance at March 31, 2014
 
 
 
 
 
 
 
Goodwill before impairment
492,619

 
394,026

 
428,835

 
1,315,480

Accumulated impairment losses
(433,469
)
 
—

 
(335,574
)
 
(769,043
)
Goodwill, net
$
59,150

 
$
394,026

 
$
93,261

 
$
546,437