Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Reconciliation between the amount determined by applying the statutory federal income tax rate to the income tax provision
Expected expense at statutory rate	$ (9,369)	$ (11,162)	$ 5,552
Change resulting from:
State tax provision, net	(756)	(976)	434
Federal and state credits	(6)	116	(167)
Domestic Production benefits			(322)
Change in valuation allowance	12,579
Nondeductible expenses and other	246	(24)	271
Income tax expense (benefit)	$ 2,694	$ (12,046)	$ 5,768
Effective income tax rate reconciliation
Effective tax rate (as a percent)	9.80%	36.70%	35.30%

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The sum of the differences between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to non-deductible expenses and other under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles and enacted tax laws.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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