GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS (Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Goodwill
Goodwill, beginning balance	$ 266,737
Acquisitions	0
Goodwill, Purchase Accounting Adjustments	(100)
Foreign currency translation	(1,300)
Goodwill, ending balance	265,296
Water Systems
Goodwill
Goodwill, beginning balance	161,500
Acquisitions	0
Goodwill, Purchase Accounting Adjustments	(100)
Foreign currency translation	(1,300)
Goodwill, ending balance	160,100
Fueling Systems
Goodwill
Goodwill, beginning balance	67,700
Acquisitions	0
Goodwill, Purchase Accounting Adjustments	0
Foreign currency translation	0
Goodwill, ending balance	67,700
Distribution
Goodwill
Goodwill, beginning balance	37,500
Acquisitions	0
Goodwill, Purchase Accounting Adjustments	0
Foreign currency translation	0
Goodwill, ending balance	$ 37,500