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Value Creation Plan (Disclosure of costs incurred under the Value Creation Plan) (Details) - Value Creation Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Restructuring Reserve [Roll Forward]        
Balance payable, Beginning     $ 4,227 $ 913
Costs incurred and charged to expense $ 989 $ 4,837 3,463 8,370
Cash payments, net     (7,702) (7,654)
Non-cash adjustments     816 2,872
Balance payable, Ending 804 4,501 804 4,501
Asset impairments and facility closure costs [Member]        
Restructuring Reserve [Roll Forward]        
Balance payable, Beginning     201 477
Costs incurred and charged to expense     365 308
Cash payments, net     (438) (533)
Non-cash adjustments     (78) 0
Balance payable, Ending 50 252 50 252
Employee recruitment, retention and termination costs [Member]        
Restructuring Reserve [Roll Forward]        
Balance payable, Beginning     4,026 436
Costs incurred and charged to expense     1,524 7,098
Cash payments, net     (5,690) (6,220)
Non-cash adjustments     894 2,872
Balance payable, Ending 754 4,186 754 4,186
Professional fees and temporary labor costs [Member]        
Restructuring Reserve [Roll Forward]        
Balance payable, Beginning     0 0
Costs incurred and charged to expense     1,574 964
Cash payments, net     (1,574) (901)
Non-cash adjustments     0 0
Balance payable, Ending $ 0 $ 63 $ 0 $ 63