Goodwill and Intangible Assets, Net (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning balance	$ 199,873	$ 178,228	$ 178,934
Business combinations	20,282	13,541	1,720
Impact of changes in foreign currency exchange rates	(5,666)	8,104	(2,426)
Ending balance	214,489	199,873	178,228
CAG
Goodwill [Roll Forward]
Beginning balance	166,236	146,194	145,191
Business combinations	20,282	13,541	1,720
Impact of changes in foreign currency exchange rates	(4,132)	6,501	(717)
Ending balance	182,386	166,236	146,194
Water
Goodwill [Roll Forward]
Beginning balance	11,951	10,890	13,038
Business combinations	0	0	0
Impact of changes in foreign currency exchange rates	(730)	1,061	(2,148)
Ending balance	11,221	11,951	10,890
LPD
Goodwill [Roll Forward]
Beginning balance	15,155	14,613	14,174
Business combinations	0	0	0
Impact of changes in foreign currency exchange rates	(804)	542	439
Ending balance	14,351	15,155	14,613
Other
Goodwill [Roll Forward]
Beginning balance	6,531	6,531	6,531
Business combinations	0	0	0
Impact of changes in foreign currency exchange rates	0	0	0
Ending balance	$ 6,531	$ 6,531	$ 6,531