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Income Taxes (Schedule of Deferred Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 29, 2017 | Dec. 30, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carry-forwards | $ 244,205 | $ 471,327
Book over tax depreciation and amortization | 39,472 | 70,617
Tax credit and charitable contribution carry-forwards | 66,770 | 64,367
Deferred revenue | 53,543 | 0
Amortization of deferred stock compensation – non-qualified | 8,966 | 14,780
Accruals and reserves not currently deductible | 4,914 | 8,117
Other assets | 1,088 | 106
Total deferred tax assets | 418,958 | 629,314
Valuation allowance | (418,958) | (629,062)
Net deferred tax assets |  | 252
Deferred tax liabilities: |  |
Unrealized gains on derivatives and other liabilities | 0 | (252)
Total deferred tax liabilities | 0 | (252)
Net deferred taxes | $ 0 | $ 0

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