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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 04, 2020
Mar. 30, 2019
Income Taxes    
Provision (benefit) for income taxes $ (587) $ (2,480)
Effective income tax rate (as a percent) (35.40%) (85.00%)
Gross unrecognized tax benefits $ 3,000  
Gross unrecognized tax benefits which would affect the effective tax rate if recognized 2,100  
Norwegian    
Income Taxes    
Additional income tax expense 13,500  
Norwegian | 2013 | Under appeal    
Income Taxes    
Additional income tax expense $ 141,300