RESTRUCTURING (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Restructuring Cost and Reserve
Restructuring (income)/expense	$ 828,000	$ 88,000	$ 2,235,000	$ 74,000
Restructuring reserve	0	0	0	0
Employee severance
Restructuring Cost and Reserve
Restructuring (income)/expense	200,000		1,100,000
Equipment relocation
Restructuring Cost and Reserve
Restructuring (income)/expense	100,000		100,000
Asset write-off
Restructuring Cost and Reserve
Restructuring (income)/expense	100,000		100,000
Other
Restructuring Cost and Reserve
Restructuring (income)/expense	400,000		900,000
Corporate Headquarters relocation
Restructuring Cost and Reserve
Restructuring (income)/expense	600,000
Siloam Springs
Restructuring Cost and Reserve
Restructuring (income)/expense				500,000
Asset sale
Restructuring Cost and Reserve
Restructuring (income)/expense				(400,000)
Water Systems
Restructuring Cost and Reserve
Restructuring (income)/expense	700,000		1,700,000
Water Systems | Employee severance
Restructuring Cost and Reserve
Restructuring (income)/expense	100,000		600,000
Water Systems | Equipment relocation
Restructuring Cost and Reserve
Restructuring (income)/expense	100,000		100,000
Water Systems | Asset write-off
Restructuring Cost and Reserve
Restructuring (income)/expense	100,000		100,000
Water Systems | Other
Restructuring Cost and Reserve
Restructuring (income)/expense	400,000		900,000
Fueling Systems
Restructuring Cost and Reserve
Restructuring (income)/expense	100,000		500,000
Fueling Systems | Employee severance
Restructuring Cost and Reserve
Restructuring (income)/expense	100,000		500,000
Fueling Systems | Equipment relocation
Restructuring Cost and Reserve
Restructuring (income)/expense	0		0
Fueling Systems | Asset write-off
Restructuring Cost and Reserve
Restructuring (income)/expense	0		0
Fueling Systems | Other
Restructuring Cost and Reserve
Restructuring (income)/expense	0		0
Other
Restructuring Cost and Reserve
Restructuring (income)/expense	0		0
Other | Employee severance
Restructuring Cost and Reserve
Restructuring (income)/expense	0		0
Other | Equipment relocation
Restructuring Cost and Reserve
Restructuring (income)/expense	0		0
Other | Asset write-off
Restructuring Cost and Reserve
Restructuring (income)/expense	0		0
Other | Other
Restructuring Cost and Reserve
Restructuring (income)/expense	$ 0		$ 0