GOODWILL AND OTHER INTANGIBLE ASSETS (Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill
Goodwill, beginning balance	$ 236,810
Acquisitions	1,500
Foreign currency translation	700
Goodwill, ending balance	239,000
Water Systems
Goodwill
Goodwill, beginning balance	139,300
Acquisitions	0
Foreign currency translation	600
Goodwill, ending balance	139,900
Fueling Systems
Goodwill
Goodwill, beginning balance	63,600
Acquisitions	0
Foreign currency translation	100
Goodwill, ending balance	63,700
Distribution
Goodwill
Goodwill, beginning balance	33,900
Acquisitions	1,500
Foreign currency translation	0
Goodwill, ending balance	$ 35,400