Inventory (Details) (USD $) In Thousands, unless otherwise specified	Jun. 15, 2013	Dec. 29, 2012
Oil inventory	$ 14,108	$ 11,549
Solvents Inventory	9,413	10,076
Machines Inventory	2,607	2,470
Drums Inventory	1,955	1,859
Accessories Inventory	1,578	1,518
Inventory, Gross	29,661	27,472
Inventory Valuation Reserves	(217)	(241)
Inventory - net	$ 29,444	$ 27,231