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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
The following table reflects goodwill allocated to each reporting segment at December 31, 2015 and 2014:

 
Electricity
 
Gas
 
Water
 
Total Company
 
(in thousands)
Goodwill balance at January 1, 2014
 
 
 
 
 
 
 
Goodwill before impairment
$
493,610

 
$
394,878

 
$
429,783

 
$
1,318,271

Accumulated impairment losses
(434,352
)
 
—

 
(336,315
)
 
(770,667
)
Goodwill, net
59,258

 
394,878

 
93,468

 
547,604

 
 
 
 
 
 
 
 
Effect of change in exchange rates
(3,571
)
 
(35,393
)
 
(7,820
)
 
(46,784
)
 
 
 
 
 
 
 
 
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

 
 
 
 
 
 
 
 
Goodwill acquired
—

 
—

 
4,684

 
4,684

Effect of change in exchange rates
(2,954
)
 
(28,049
)
 
(6,379
)
 
(37,382
)
 
 
 
 
 
 
 
 
Goodwill balance at December 31, 2015
 
 
 
 
 
 
 
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
Schedule of Purchase Price Allocation [Table Text Block]
The purchase price of Temetra includes the following:

 
Total Purchase Price
 
(in thousands)
Cash paid (net of $1,395 cash received)
$
5,754

Estimated working capital adjustment
905

Fair value of contingent consideration
3,122

Total purchase price
$
9,781