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STOCK BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 28, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of the performance based RSUs, RSUs, and DSUs
A summary of the balances of our stock-based compensation plans as of September 28, 2019, and changes during the nine months ended September 28, 2019, is presented below (in thousands, except per share data):
Stock OptionsPerformance-Based
Restricted Stock Units		Restricted Stock UnitsDeferred Stock Units
Number ofOptionsWeighted
Average Exercise
Price		Number ofRSUsWeighted
Average Grant
Date Fair Value		Number ofRSUsWeighted
Average Grant Date
Fair Value		Number ofDSUsWeighted
Average Grant
Date Fair Value
Balance, December 29, 20182,889  $6.56  1,411  $31.74  7  $17.00  13  $17.00  
Granted601  23.59  —  —  338  23.69  10  24.80  
Exercised/released(1,570) 1.73  —  —  (10) 17.51  —  —  
Forfeited/expired(102) 20.10  (127) 31.74  (26) 22.84  —  —  
Balance, September 28, 20191,818  $15.62  1,284  $31.74  309  $23.81  23  $20.34  
Summary assumptions utilized to calculate fair value of stock options granted
The following assumptions were utilized to calculate the fair value of stock options granted during the nine months ended September 28, 2019:
Nine Months Ended
September 28,
2019
Expected option term6 years
Expected stock price volatility27% - 35%  
Risk-free interest rate1.64% - 2.53%  
Expected dividend yield–%  
Weighted average fair value at date of grant$7.67