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Income Taxes (Details)
$ in Thousands, kr in Millions
3 Months Ended 6 Months Ended
Jul. 04, 2020
USD ($)
Jun. 29, 2019
USD ($)
Jul. 04, 2020
USD ($)
Jul. 04, 2020
NOK (kr)
Jun. 29, 2019
USD ($)
Income Taxes          
Provision (benefit) for income taxes $ 381 $ 29,276 $ (206)   $ 26,796
Effective income tax rate (as a percent) (26.40%) 221.00% (95.80%) (95.80%) 165.80%
Gross unrecognized tax benefits $ 2,400   $ 2,400    
Gross unrecognized tax benefits which would affect the effective tax rate if recognized $ 2,000   2,000    
Norwegian          
Income Taxes          
Additional income tax expense     $ 14,900    
Norwegian | 2013 | Under appeal          
Income Taxes          
Additional income tax expense | kr       kr 141.3