SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011
Sales and operating income of segments [Abstract]
Net outside sales	$ 112,946	$ 77,439	$ 331,239	$ 229,544
Intersegment sales	4,021	3,253	13,054	9,560
Operating income for reportable segments	8,868	7,199	27,706	15,383
Reconciliation of segment operating income to consolidated operating income [Abstract]
Operating income for reportable segments	8,868	7,199	27,706	15,383
Corporate incentive agreements	(121)	(44)	(211)	37
Gain on sale of fixed assets and acquisition of business	234	11	237	263
Unallocated corporate expenses	(1,670)	(1,922)	(5,308)	(5,172)
Consolidated operating income	7,311	5,244	22,424	10,511
Manufacturing [Member]
Segment Reporting Information [Line Items]
Percentage of net sales contributed by segment (in hundredths)			76.00%	76.00%
Sales and operating income of segments [Abstract]
Net outside sales	82,365	57,786	250,601	173,648
Intersegment sales	3,574	3,219	11,711	9,501
Operating income for reportable segments	7,285	6,459	23,551	13,940
Reconciliation of segment operating income to consolidated operating income [Abstract]
Operating income for reportable segments	7,285	6,459	23,551	13,940
Distribution [Member]
Segment Reporting Information [Line Items]
Percentage of net sales contributed by segment (in hundredths)			24.00%	24.00%
Sales and operating income of segments [Abstract]
Net outside sales	30,581	19,653	80,638	55,896
Intersegment sales	447	34	1,343	59
Operating income for reportable segments	1,583	740	4,155	1,443
Reconciliation of segment operating income to consolidated operating income [Abstract]
Operating income for reportable segments	$ 1,583	$ 740	$ 4,155	$ 1,443