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Leases Additional Balance Sheet information (Details) - USD ($) $ in Thousands | Dec. 27, 2020 | Dec. 29, 2019 | Dec. 31, 2018 | Dec. 30, 2018
--- | --- | --- | --- | ---
Finance |  |  |  |
Right of use assets, net | $ 9,644 | $ 7,552 |  |
Finance Lease Liabilities |  |  |  |
Current portion of lease obligations | 1,078 | 725 |  |
Long-term portion of lease obligations | 10,937 | 8,822 |  |
Present value of lease liability | 12,015 | 9,547 |  |
Operating |  |  |  |
Right of use assets, net | 415,929 | 418,696 |  |
Operating Lease Liabilities |  |  |  |
Current portion of lease obligations | 54,197 | 41,974 |  |
Long-term portion of lease obligations | 454,296 | 456,613 |  |
Total | $ 508,493 | 498,587 |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:LiabilitiesCurrentAbstract |  |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:LiabilitiesNoncurrentAbstract |  |  |
Total |  |  |  |
Right of use assets, net | $ 425,573 | 426,248 | $ 478,268 | $ 0
Total |  |  |  |
Current portion of lease obligations | 55,275 | 42,699 | 41,392 | 786
Long-term portion of lease obligations | 465,233 | 465,435 |  |
Total | $ 520,508 | $ 508,134 | $ 516,159 | $ 9,414
Operating Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:LiabilitiesAbstract | us-gaap:LiabilitiesAbstract |  |

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