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Income Taxes (Details)
$ in Thousands, kr in Millions
3 Months Ended
Apr. 03, 2021
USD ($)
Apr. 03, 2021
NOK (kr)
Apr. 04, 2020
USD ($)
Income Taxes      
Provision (benefit) for income taxes $ 201   $ (587)
Effective income tax rate (as a percent) 1.50% 1.50% (35.40%)
Gross unrecognized tax benefits $ 3,200    
Gross unrecognized tax benefits which would affect the effective tax rate if recognized 2,500    
Norwegian | 2013 | Under appeal      
Income Taxes      
Additional income tax expense $ 16,600 kr 141.3