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Indebtedness (Schedule of Indebtedness Outstanding) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 28, 2019
Debt Instrument [Line Items]    
Long-term Debt $ 1,336,662 $ 1,039,162
Debt Issuance Costs, Noncurrent, Net (593) (780)
Long-term debt 1,336,069 1,038,382
Line of Credit [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 600,000 600,000
Debt Instrument, Maturity Date May 05, 2024  
Senior Notes - Series 2020-A due March 11, 2030    
Debt Instrument [Line Items]    
Long-term Debt $ 300,000 0
Debt Instrument, Maturity Date Mar. 11, 2030  
Senior Notes - Series 2015-A due February 15, 2022    
Debt Instrument [Line Items]    
Long-term Debt $ 225,000 225,000
Debt Instrument, Maturity Date Feb. 15, 2022  
Senior Notes - Series 2015-B due February 14, 2025    
Debt Instrument [Line Items]    
Long-term Debt $ 200,000 200,000
Debt Instrument, Maturity Date Feb. 14, 2025  
Other [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 11,662 $ 14,162
Debt Instrument, Maturity Date Sep. 01, 2025