SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information
Net sales	$ 341,866	$ 311,113	$ 981,466	$ 836,714
Operating income/(loss)	40,137	31,983	103,311	84,759
Total assets	1,192,151		1,192,151		$ 1,185,353
Distribution
Segment Reporting Information
Net sales
Fueling Systems
Segment Reporting Information
Net sales
Operating Segments | Water Systems
Segment Reporting Information
Net sales	198,300	196,000	600,500	561,900
Operating income/(loss)	28,400	28,300	85,900	82,500
Total assets	678,400		678,400		695,400
Operating Segments | Distribution
Segment Reporting Information
Net sales	78,000	68,100	213,700	127,200
Operating income/(loss)	3,100	2,000	6,300	5,700
Total assets	175,100		175,100		153,100
Operating Segments | Fueling Systems
Segment Reporting Information
Net sales	78,800	64,100	212,300	177,800
Operating income/(loss)	20,900	17,100	53,400	43,000
Total assets	283,100		283,100		265,700
Operating Segments | Corporate And Eliminations
Segment Reporting Information
Total assets	55,600		55,600		$ 71,200
Intersegment Sales | Distribution
Segment Reporting Information
Net sales	0	0	0	0
Intersegment Sales | Fueling Systems
Segment Reporting Information
Net sales	0	0	0	0
Corporate And Eliminations
Segment Reporting Information
Net sales	(13,200)	(17,100)	(45,000)	(30,200)
Operating income/(loss)	(12,300)	(15,400)	(42,300)	(46,400)
United States & Canada | Water Systems
Segment Reporting Information
Net sales	92,600	80,000	267,200	239,100
United States & Canada | Distribution
Segment Reporting Information
Net sales	78,000	68,100	213,700	127,200
United States & Canada | Fueling Systems
Segment Reporting Information
Net sales	44,700	40,900	116,000	106,500
United States & Canada | Intersegment Sales | Water Systems
Segment Reporting Information
Net sales	13,200	17,100	45,000	30,200
Latin America | Water Systems
Segment Reporting Information
Net sales	31,200	32,600	89,300	96,600
EMEA | Water Systems
Segment Reporting Information
Net sales	44,000	46,900	141,800	133,400
Asia Pacific | Water Systems
Segment Reporting Information
Net sales	17,300	19,400	57,200	62,600
All Other | Fueling Systems
Segment Reporting Information
Net sales	$ 34,100	$ 23,200	$ 96,300	$ 71,300