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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill Excluding Non Goodwill Intangibles [Abstract]  
Schedule of 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
—

 
—

 
—

 
570,790

 
570,790

Effect of change in exchange rates
(370
)
 
(3,259
)
 
(785
)
 
(243
)
 
(4,657
)
 
 
 
 
 
 
 
 
 
 
Goodwill balance at September 30, 2018
 
 
 
 
 
 
 
 
 
Goodwill before impairment
496,565

 
349,444

 
374,569

 
570,547

 
1,791,125

Accumulated impairment losses
(382,694
)
 
—

 
(286,536
)
 
—

 
(669,230
)
Goodwill, net
$
113,871

 
$
349,444

 
$
88,033

 
$
570,547

 
$
1,121,895