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Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Loss from discontinued operations:        
Workers' compensation costs $ (15) $ (52) $ (42) $ (85)
Environmental remediation costs (13) (158) (53) (283)
Loss from discontinued operations, before taxes (28) (210) (95) (368)
Income tax benefit (8) (43) (28) (96)
Loss from discontinued operations, net of tax $ (20) $ (167) $ (67) $ (272)