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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Dec. 30, 2018
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]          
Other income, net $ (106,203) $ (2,969) $ (98,103) $ 5,623  
Fair Value investments notice period     45 days    
Minimum          
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]          
Fair Value investments notice period     30 days    
Maximum          
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]          
Fair Value investments notice period     90 days    
Fair Value, Recurring          
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]          
Available for sale investments, fair value option 24,358 24,219 $ 24,358 24,219 $ 23,913
Other income, net $ 177 $ (342) $ 727 $ 106