Goodwill And Intangible Assets, Net (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segments Of Goodwill [Line Items]
Beginning balance	$ 178,934	$ 184,450	$ 180,521
Business Combinations	1,720	5,047	13,077
Impact of Changes in Foreign Currency Exchange Rates	(2,426)	(10,563)	(9,148)
Ending balance	178,228	178,934	184,450
CAG [Member]
Segments Of Goodwill [Line Items]
Beginning balance	145,191	148,151	141,408
Business Combinations	1,720	5,047	13,077
Impact of Changes in Foreign Currency Exchange Rates	(717)	(8,007)	(6,334)
Ending balance	146,194	145,191	148,151
Water Segment [Member]
Segments Of Goodwill [Line Items]
Beginning balance	13,038	13,689	14,515
Impact of Changes in Foreign Currency Exchange Rates	(2,148)	(651)	(826)
Ending balance	10,890	13,038	13,689
LPD [Member]
Segments Of Goodwill [Line Items]
Beginning balance	14,174	16,079	18,067
Impact of Changes in Foreign Currency Exchange Rates	439	(1,905)	(1,988)
Ending balance	14,613	14,174	16,079
Other Segment [Member]
Segments Of Goodwill [Line Items]
Beginning balance	6,531	6,531	6,531
Ending balance	$ 6,531	$ 6,531	$ 6,531