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Value Creation Plan (Exiting Flexible Resealable Pouch and Nutrition Bar Product Lines and Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Restructuring Cost and Reserve [Line Items]        
Revenues $ 319,308 $ 336,454 $ 631,960 $ 666,485
Earnings (loss) from continuing operations before income taxes (4,416) (5,683) $ (10,571) (21,836)
Nutrition Bar [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and Related Cost, Description     For the two quarters ended June 30, 2018, the loss before income taxes from these operations included the recognition of the remaining lease obligation of $1.3 million related to the vacated nutrition bar processing facility. These operations are included in the Consumer Products operating segment.  
Flexible Resealable Pouch and Nutrition Bar [Member]        
Restructuring Cost and Reserve [Line Items]        
Revenues 500 15,200 $ 3,100 30,500
Earnings (loss) from continuing operations before income taxes $ 400 $ (2,300) $ (900) $ (4,300)