SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information
Net sales	$ 266,754	$ 290,715
Operating income/(loss)	13,821	12,121
Total assets	1,149,533		$ 1,194,743
Corporate And Eliminations
Segment Reporting Information
Net sales	(13,000)	(11,200)
Operating income/(loss)	(14,900)	(15,100)
Total assets	49,500		72,400
Water Systems | Operating Segments
Segment Reporting Information
Net sales	164,100	188,400
Operating income/(loss)	18,800	19,200
Total assets	635,200		658,300
Water Systems | United States & Canada
Segment Reporting Information
Net sales	70,900	86,800
Water Systems | United States & Canada | Intersegment Sales
Segment Reporting Information
Net sales	13,000	11,200
Water Systems | Latin America
Segment Reporting Information
Net sales	28,200	30,500
Water Systems | EMEA
Segment Reporting Information
Net sales	38,200	37,700
Water Systems | Asia Pacific
Segment Reporting Information
Net sales	13,800	22,200
Distribution | Operating Segments
Segment Reporting Information
Net sales	60,400	53,300
Operating income/(loss)	(2,200)	(4,300)
Total assets	192,500		180,200
Distribution | United States & Canada
Segment Reporting Information
Net sales	60,400	53,300
Distribution | United States & Canada | Intersegment Sales
Segment Reporting Information
Net sales	0	0
Fueling Systems | Operating Segments
Segment Reporting Information
Net sales	55,300	60,200
Operating income/(loss)	12,100	12,300
Total assets	272,300		$ 283,800
Fueling Systems | Intersegment Sales
Segment Reporting Information
Net sales	0	0
Fueling Systems | United States & Canada
Segment Reporting Information
Net sales	37,400	35,100
Fueling Systems | All Other
Segment Reporting Information
Net sales	$ 17,900	$ 25,100