Indebtedness (Schedule of Future Maturities of Indebtedness) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 28, 2019
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	$ 1,336,662	$ 1,039,162
2021
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
2022
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	225,000
2023
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
2024
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	600,000
2025
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	211,662
2026 and thereafter
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	300,000
Line of Credit [Member]
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	600,000
Line of Credit [Member] | 2021
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Line of Credit [Member] | 2022
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Line of Credit [Member] | 2023
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Line of Credit [Member] | 2024
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	600,000
Line of Credit [Member] | 2025
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Line of Credit [Member] | 2026 and thereafter
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Senior Notes [Member]
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	725,000
Senior Notes [Member] | 2021
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Senior Notes [Member] | 2022
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	225,000
Senior Notes [Member] | 2023
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Senior Notes [Member] | 2024
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Senior Notes [Member] | 2025
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	200,000
Senior Notes [Member] | 2026 and thereafter
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	300,000
Other [Member]
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	11,662
Other [Member] | 2021
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Other [Member] | 2022
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Other [Member] | 2023
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Other [Member] | 2024
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	0
Other [Member] | 2025
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	11,662
Other [Member] | 2026 and thereafter
Schedule of Future Maturities of Indebtedness [Line Items]
Long-term Debt	$ 0