PROPERTY, PLANT AND EQUIPMENT (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
Major components of property, plant and equipment
Property, plant and equipment, Gross	$ 407,223		$ 407,223		$ 382,182
Less: accumulated depreciation and amortization	168,585		168,585		144,260
Property, plant and equipment, Net	238,638		238,638		237,922
Net book value of internally developed software costs	4,989		4,989		5,777
Depreciation of capitalized internal-use computer software costs	842	$ 839	2,382	$ 2,381
Depreciation expense	8,423	$ 8,014	24,701	$ 23,096
Land
Major components of property, plant and equipment
Property, plant and equipment, Gross	5,396		5,396		5,396
Land improvements
Major components of property, plant and equipment
Property, plant and equipment, Gross	$ 4,651		4,651		4,594
Useful Life (years)	5 years
Buildings
Major components of property, plant and equipment
Property, plant and equipment, Gross	$ 151,885		151,885		146,930
Buildings | Minimum
Major components of property, plant and equipment
Useful Life (years)	20 years
Buildings | Maximum
Major components of property, plant and equipment
Useful Life (years)	30 years
Machinery and equipment
Major components of property, plant and equipment
Property, plant and equipment, Gross	$ 207,944		207,944		195,561
Machinery and equipment | Minimum
Major components of property, plant and equipment
Useful Life (years)	5 years
Machinery and equipment | Maximum
Major components of property, plant and equipment
Useful Life (years)	15 years
Software
Major components of property, plant and equipment
Property, plant and equipment, Gross	$ 19,832		19,832		18,229
Software | Minimum
Major components of property, plant and equipment
Useful Life (years)	3 years
Software | Maximum
Major components of property, plant and equipment
Useful Life (years)	5 years
Furniture and fixtures
Major components of property, plant and equipment
Property, plant and equipment, Gross	$ 2,724		2,724		2,421
Furniture and fixtures | Minimum
Major components of property, plant and equipment
Useful Life (years)	3 years
Furniture and fixtures | Maximum
Major components of property, plant and equipment
Useful Life (years)	10 years
Vehicles
Major components of property, plant and equipment
Property, plant and equipment, Gross	$ 1,278		1,278		1,302
Vehicles | Minimum
Major components of property, plant and equipment
Useful Life (years)	2 years
Vehicles | Maximum
Major components of property, plant and equipment
Useful Life (years)	5 years
Construction in progress
Major components of property, plant and equipment
Property, plant and equipment, Gross	$ 13,513		$ 13,513		$ 7,749