Schedule of Goodwill Allocated to Reporting Segments (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill Excluding Non Goodwill Intangibles [Abstract]

Schedule of Goodwill [Table Text Block]

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	—			—		—			572,499		572,499
Effect of change in exchange rates	1,031			10,788		2,560			117		14,496
Goodwill balance at March 31, 2018
Goodwill before impairment	514,057			363,491		393,693			572,616		1,843,857
Accumulated impairment losses	(398,785		)	—		(302,315		)	—		(701,100		)
Goodwill, net	$	115,272		$	363,491	$	91,378		$	572,616	$	1,142,757