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Goodwill - Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]            
Gross Carrying Amount $ 405,872   $ 405,872   $ 430,712  
Accumulated Amortization (164,579)   (164,579)   (158,809)  
Net 241,293   241,293   $ 271,903  
Amortization of Intangible Assets $ 9,352 $ 10,443 29,041 $ 33,786    
Amortizable trade name            
Finite-Lived Intangible Assets [Line Items]            
Gross Carrying Amount           $ 101,000
Impairment of Intangible Assets, Finite-lived   $ 55,000   55,000    
Impairment of Intangible Assets (Excluding Goodwill)       46,000    
Customer relationships            
Finite-Lived Intangible Assets [Line Items]            
Weighted-Average Life 12 years       12 years  
Gross Carrying Amount $ 331,865   331,865   $ 354,305  
Accumulated Amortization (149,056)   (149,056)   (148,632)  
Net $ 182,809   182,809   $ 205,673  
Amortizable trade name            
Finite-Lived Intangible Assets [Line Items]            
Weighted-Average Life 8 years       8 years  
Gross Carrying Amount $ 74,007   74,007   $ 76,407  
Accumulated Amortization (15,523)   (15,523)   (10,177)  
Net $ 58,484   $ 58,484   $ 66,230  
Net of Tax [Member] | Amortizable trade name            
Finite-Lived Intangible Assets [Line Items]            
Impairment of Intangible Assets (Excluding Goodwill)       $ 34,653