Schedule of Goodwill Allocated to Reporting Segments (Tables)

3 Months Ended

Mar. 31, 2017

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			Total Company
	(in thousands)
Balances at January 1, 2017
Goodwill before impairment	$	400,299		$	319,913	$	334,505		$	1,054,717
Accumulated impairment losses	(348,926		)	—		(253,297		)	(602,223		)
Goodwill, net	51,373			319,913		81,208			452,494
Effect of change in exchange rates	776			7,774		1,862			10,412
Balances at March 31, 2017
Goodwill before impairment	409,960			327,687		345,042			1,082,689
Accumulated impairment losses	(357,811		)	—		(261,972		)	(619,783		)
Goodwill, net	$	52,149		$	327,687	$	83,070		$	462,906