Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Summary of the activity related to gross unrecognized tax benefits
Beginning balance	$ 2,036	$ 3,187	$ 3,054
Additions based on tax positions related to current year	436	630	456
Additions based on tax positions related to prior years		115	114
Reductions based on tax positions related to prior years	(196)
Reductions for tax positions as a result of a lapse of the applicable statute of limitations		(1,896)	(437)
Ending balance	2,276	2,036	3,187
Unrecognized tax benefits
Gross unrecognized tax benefits, inclusive of interest	2,400	2,100	3,200
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	1,900	$ 2,100	$ 3,200
Norwegian \| 2013 \| Under appeal
Unrecognized tax benefits
Additional income tax expense	$ 16,000

Estimated amount of loss resulting from an adverse tax position.

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