Indebtedness (Schedule of Minimum Annual Payments Under Capital Lease Obligations and Maturities of Indebtedness) (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Minimum Lease Payments	$ 13,447
Less: Interest	379
Principal	13,068
Carrying amount of long-term debt	500,000
Total debt and capital lease obligations	527,230	$ 564,365
2018
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Minimum Lease Payments	11,921
Less: Interest	336
Principal	11,585
Total debt and capital lease obligations	11,585
2019
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Minimum Lease Payments	1,526
Less: Interest	43
Principal	1,483
Total debt and capital lease obligations	3,983
2020
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Minimum Lease Payments	0
Less: Interest	0
Principal	0
Total debt and capital lease obligations	0
2021
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Minimum Lease Payments	0
Less: Interest	0
Principal	0
Total debt and capital lease obligations	1,100
2022
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Minimum Lease Payments	0
Less: Interest	0
Principal	0
Total debt and capital lease obligations	301,700
2023 and thereafter
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Minimum Lease Payments	0
Less: Interest	0
Principal	0
Total debt and capital lease obligations	208,862
Senior Notes [Member]
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	500,000
Senior Notes [Member] | 2018
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	0
Senior Notes [Member] | 2019
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	0
Senior Notes [Member] | 2020
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	0
Senior Notes [Member] | 2021
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	0
Senior Notes [Member] | 2022
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	300,000
Senior Notes [Member] | 2023 and thereafter
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	200,000
Other [Member]
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	14,162
Other [Member] | 2018
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	0
Other [Member] | 2019
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	2,500
Other [Member] | 2020
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	0
Other [Member] | 2021
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	1,100
Other [Member] | 2022
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	1,700
Other [Member] | 2023 and thereafter
Schedule of Future Minimum Lease Payments For Capital Leases and Maturities of Indebtedness [Line Items]
Carrying amount of long-term debt	$ 8,862