SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011
Segment Reporting Information
Net sales to external customers	$ 237,557	$ 224,391	$ 686,177	$ 633,841
Operating income (loss)	33,492	28,324	92,000	77,072
Total assets	964,843		964,843		829,530
Water Systems
Segment Reporting Information
Net sales to external customers	189,800	179,400	557,500	510,100
Operating income (loss)	35,100	29,000	102,000	86,700
Total assets	707,900		707,900		535,300
Fueling Systems
Segment Reporting Information
Net sales to external customers	47,800	45,000	128,700	123,700
Operating income (loss)	11,400	9,600	26,000	22,200
Total assets	233,500		233,500		222,200
Other
Segment Reporting Information
Net sales to external customers	0	0	0	0
Operating income (loss)	(13,000)	(10,300)	(36,000)	(31,800)
Total assets	$ 23,400		$ 23,400		$ 72,000