Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details 1)

v3.4.0.3
Fair Value of Financial Instruments (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 02, 2016
Mar. 28, 2015
Summary of maturities of marketable securities    
Due in less than one year, adjusted cost $ 15,234  
Due after one year but within five years, adjusted cost 16,731  
Due after five years but within ten years, adjusted cost 5,386  
Due after ten years, adjusted cost 2,917  
Equity securities, adjusted cost 1,005  
Mutual Funds, adjusted cost 2,451  
Due in less than one year, fair value 15,143  
Due after one year but within five years, fair value 16,074  
Due after five years but within ten years, fair value 4,868  
Due after ten years, fair value 2,783  
Equity securities, fair value 985  
Mutual Funds, fair value 2,175  
Available-for-sale Debt Securities, Amortized Cost Basis 43,724  
Asset measured at, fair value $ 42,028  
Phantom Share Units (PSUs) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Fair Value Liability Recorded for Share Based Awards Related Expense $ 4 $ 11