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Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Expected income tax expense at statutory rate	$ 8,594	$ 5,546	$ 4,943
Permanent differences	92	64	53
State tax expense, net of federal benefit	395	544	15
Foreign tax expense	132	236	168
Foreign tax credits	(132)	(236)	(168)
Increase in unrecognized tax benefit	185	104	28
Valuation allowance	0	(317)	306
Other	(147)	(202)	(33)
Income tax expense	$ 9,119	$ 5,739	$ 5,312
Maximum
Income Taxes [Line Items]
Federal statutory tax rate		35.00%
Domestic Tax Authority | Minimum
Income Taxes [Line Items]
Federal statutory tax rate			34.00%
Domestic Tax Authority | Maximum
Income Taxes [Line Items]
Federal statutory tax rate	35.00%

X

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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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