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Revenue (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Disaggregation of Revenue [Line Items]        
Segment revenues from external customers $ 295,941 $ 308,371 $ 894,220 $ 940,331
Flexible resealable pouch and nutrition bar products        
Disaggregation of Revenue [Line Items]        
Segment revenues from external customers   $ 0   $ 3,100