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Marketable Securities (Details 3) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Amortized Cost    
Due in one year or less $ 168,370  
Due after one year through five years 1,175,500  
Due after five years through ten years 160,650  
Due after ten years 14,567  
Total 1,519,087 $ 1,446,428
Fair Value    
Due in one year or less 167,745  
Due after one year through five years 1,143,859  
Due after five years through ten years 151,195  
Due after ten years 14,131  
Total $ 1,476,930 $ 1,421,720