SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information
Net sales	$ 295,630	$ 220,252
Operating income/(loss)	22,700	18,505
Total assets	1,240,664		$ 1,185,353
Distribution
Segment Reporting Information
Net sales	0	0
Fueling Systems
Segment Reporting Information
Net sales	0	0
Operating Segments | Water Systems
Segment Reporting Information
Net sales	191,800	167,600
Operating income/(loss)	25,200	21,400
Total assets	710,100		695,400
Operating Segments | Distribution
Segment Reporting Information
Net sales	56,200	0
Operating income/(loss)	(800)	0
Total assets	171,800		153,100
Operating Segments | Fueling Systems
Segment Reporting Information
Net sales	59,400	52,700
Operating income/(loss)	13,600	11,000
Total assets	277,600		265,700
Operating Segments | Corporate And Eliminations
Segment Reporting Information
Total assets	81,200		$ 71,200
Intersegment Sales | Distribution
Segment Reporting Information
Net sales	0	0
Intersegment Sales | Fueling Systems
Segment Reporting Information
Net sales	0	0
Corporate And Eliminations
Segment Reporting Information
Net sales	(11,800)	0
Operating income/(loss)	(15,300)	(13,900)
United States & Canada | Water Systems
Segment Reporting Information
Net sales	80,800	71,700
United States & Canada | Distribution
Segment Reporting Information
Net sales	56,200	0
United States & Canada | Fueling Systems
Segment Reporting Information
Net sales	32,800	29,500
United States & Canada | Intersegment Sales | Water Systems
Segment Reporting Information
Net sales	11,800	0
Latin America | Water Systems
Segment Reporting Information
Net sales	29,100	33,000
EMEA | Water Systems
Segment Reporting Information
Net sales	49,300	41,400
Asia Pacific | Water Systems
Segment Reporting Information
Net sales	20,800	21,500
AllOther [Member] | Fueling Systems
Segment Reporting Information
Net sales	$ 26,600	$ 23,200