SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Apr. 02, 2016	Dec. 31, 2016
Segment Reporting Information
Net sales to external customers	$ 220,252	$ 218,430
Operating income/(loss)	18,510	21,071
Total assets	1,055,280		$ 1,039,905
Operating Segments | Water Systems
Segment Reporting Information
Net sales to external customers	167,200	168,800
Operating income/(loss)	21,400	24,200
Total assets	723,000		671,500
Operating Segments | Fueling Systems
Segment Reporting Information
Net sales to external customers	53,100	49,600
Operating income/(loss)	11,000	10,200
Total assets	252,500		251,100
Other
Segment Reporting Information
Net sales to external customers	0	0
Operating income/(loss)	(13,900)	$ (13,300)
Total assets	$ 79,800		$ 117,300