SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015	Jan. 02, 2016
Segment Reporting Information
Net sales to external customers	$ 239,755	$ 232,485	$ 710,266	$ 705,640
Operating income/(loss)	31,811	27,766	85,561	66,805
Total assets	1,044,617		1,044,617		$ 996,111
Operating Segments | Water Systems
Segment Reporting Information
Net sales to external customers	182,000	173,500	545,400	544,300
Operating income/(loss)	30,000	23,100	85,600	66,800
Total assets	706,400		706,400		677,600
Operating Segments | Fueling Systems
Segment Reporting Information
Net sales to external customers	57,800	59,000	164,900	161,300
Operating income/(loss)	15,200	15,400	40,900	37,400
Total assets	250,100		250,100		248,500
Corporate and Eliminations
Segment Reporting Information
Net sales to external customers	0	0	0	0
Operating income/(loss)	(13,400)	$ (10,700)	(40,900)	$ (37,400)
Total assets	$ 88,100		$ 88,100		$ 70,000