GOODWILL AND OTHER INTANGIBLE ASSETS (Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill
Goodwill, beginning balance	$ 236,810	$ 199,600
Acquisitions	16,000	33,900
Foreign currency translation	(4,100)	3,300
Goodwill, ending balance	248,748	236,810
Water Systems
Goodwill
Goodwill, beginning balance	139,300	136,300
Acquisitions	10,100	0
Foreign currency translation	(3,900)	3,000
Goodwill, ending balance	145,500	139,300
Fueling Systems
Goodwill
Goodwill, beginning balance	63,600	63,300
Acquisitions	4,100	0
Foreign currency translation	(200)	300
Goodwill, ending balance	67,500	63,600
Distribution
Goodwill
Goodwill, beginning balance	33,900	0
Acquisitions	1,800	33,900
Foreign currency translation	0	0
Goodwill, ending balance	$ 35,700	$ 33,900