GOODWILL AND OTHER INTANGIBLE ASSETS (Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill
Goodwill, beginning balance	$ 199,609	$ 199,800
Acquisitions	33,900	800
Foreign currency translation	3,300	(1,000)
Goodwill, ending balance	236,810	199,609
Water Systems
Goodwill
Goodwill, beginning balance	136,300	136,800
Acquisitions	0	0
Foreign currency translation	3,000	(500)
Goodwill, ending balance	139,300	136,300
Fueling Systems
Goodwill
Goodwill, beginning balance	63,300	63,000
Acquisitions	0	800
Foreign currency translation	300	(500)
Goodwill, ending balance	63,600	63,300
Distribution
Goodwill
Goodwill, beginning balance	0	0
Acquisitions	33,900	0
Foreign currency translation	0	0
Goodwill, ending balance	$ 33,900	$ 0