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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Tables)
 9 Months Ended
Sep. 30, 2015
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
The following table reflects goodwill allocated to each reporting segment as of September 30, 2015:
 
Electricity
 
Gas
 
Water
 
Total Company
 
(in thousands)
Balances 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
—

 
—

 
4,236

 
4,236

Effect of change in exchange rates
(2,411
)
 
(22,615
)
 
(5,065
)
 
(30,091
)
 
 
 
 
 
 
 
 
Balances at September 30, 2015
 
 
 
 
 
 
 
        Goodwill before impairment
421,608

 
336,870

 
357,103

 
1,115,581

Accumulated impairment losses
(368,332
)
 
—

 
(272,284
)
 
(640,616
)
Goodwill, net
$
53,276

 
$
336,870

 
$
84,819

 
$
474,965