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Goodwill
 6 Months Ended
Jun. 30, 2018
Goodwill Excluding Non Goodwill Intangibles [Abstract]  
Goodwill
Goodwill

The following table reflects goodwill allocated to each reporting unit:
 
Electricity
 
Gas
 
Water
 
Networks
 
Total Company
 
(in thousands)
Goodwill balance at January 1, 2018
 
 
 
 
 
 
 
 
 
Goodwill before impairment
$
500,625

 
$
352,703

 
$
378,901

 
$
—

 
$
1,232,229

Accumulated impairment losses
(386,384
)
 
—

 
(290,083
)
 
—

 
(676,467
)
Goodwill, net
114,241

 
352,703

 
88,818

 
—

 
555,762

 
 
 
 
 
 
 
 
 
 
Goodwill acquired
—

 
—

 
—

 
572,870

 
572,870

Effect of change in exchange rates
(706
)
 
(6,669
)
 
(1,605
)
 
(243
)
 
(9,223
)
 
 
 
 
 
 
 
 
 
 
Goodwill balance at June 30, 2018
 
 
 
 
 
 
 
 
 
Goodwill before impairment
492,367

 
346,034

 
370,031

 
572,627

 
1,781,059

Accumulated impairment losses
(378,832
)
 
—

 
(282,818
)
 
—

 
(661,650
)
Goodwill, net
$
113,535

 
$
346,034

 
$
87,213

 
$
572,627

 
$
1,119,409