Segment Information (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Revenues Gross Profit And Operating Income By Segment [Table Text Block]

Revenues, gross profit, and operating income associated with our segments were as follows:

	Year Ended December 31,
	2016			2015			2014
	(in thousands)
Revenues
Electricity	$	938,374		$	820,306		$	771,857
Gas	569,476			543,805			599,091
Water	505,336			519,422			576,668
Total Company	$	2,013,186		$	1,883,533		$	1,947,616
Gross profit
Electricity	$	282,677		$	225,446		$	200,249
Gas	205,063			185,559			211,623
Water	172,580			145,680			202,178
Total Company	$	660,320		$	556,685		$	614,050
Operating income (loss)
Electricity	$	68,287		$	31,104		$	(77,751	)
Gas	66,813			67,471			76,101
Water	37,266			19,864			71,356
Corporate unallocated	(76,155		)	(65,593		)	(69,226		)
Total Company	96,211			52,846			480
Total other income (expense)	(11,584		)	(15,744		)	(18,745		)
Income (loss) before income taxes	$	84,627		$	37,102		$	(18,265	)

Revenues By Region [Table Text Block]

Revenues by region were as follows:

	Year Ended December 31,
	2016		2015		2014
	(in thousands)
United States and Canada	$	1,126,787	$	997,293	$	875,796
Europe, Middle East, and Africa (EMEA)	698,106		701,301		849,841
Other	188,293		184,939		221,979
Total Company	$	2,013,186	$	1,883,533	$	1,947,616

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

Property, plant, and equipment, net, by geographic area were as follows:

	At December 31,
	2016		2015
	(in thousands)
United States	$	70,435	$	72,179
Outside United States	106,023		118,077
Total Company	$	176,458	$	190,256

Depreciation And Amortization Expense Associated With Segments [Table Text Block]

Depreciation and amortization expense associated with our segments was as follows:

	Year Ended December 31,
	2016		2015		2014
	(in thousands)
Electricity	$	28,468	$	35,896	$	47,889
Gas	20,714		20,288		25,706
Water	18,675		19,459		24,257
Corporate Unallocated	461		350		287
Total Company	$	68,318	$	75,993	$	98,139