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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Tables)
 6 Months Ended
Jun. 30, 2015
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
The following table reflects goodwill allocated to each reporting segment as of June 30, 2015:

 
Electricity
 
Gas
 
Water
 
Total Company
 
(in thousands)
Balance 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

 
 
 
 
 
 
 
 
Effect of change in exchange rates
(2,241
)
 
(22,057
)
 
(4,874
)
 
(29,172
)
 
 
 
 
 
 
 
 
Balance at June 30, 2015
 
 
 
 
 
 
 
        Goodwill before impairment
422,269

 
337,428

 
353,301

 
1,112,998

Accumulated impairment losses
(368,823
)
 
—

 
(272,527
)
 
(641,350
)
Goodwill, net
$
53,446

 
$
337,428

 
$
80,774

 
$
471,648