Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details 2)

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STOCKHOLDERS' EQUITY (Details 2) - Restricted Stock Units (RSUs) [Member]
3 Months Ended
Mar. 30, 2019
$ / shares
shares
Unvested restricted stock activity  
Balance outstanding at the beginning of the period (in shares) | shares 2,724
Forfeited (in shares) | shares (21)
Vested (in shares) | shares (689)
Granted (in shares) | shares 485
Balance outstanding at the end of the period (in shares) | shares 2,499
Weighted-Average Grant-Date Fair Value  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 21.08
Forfeited (in dollars per share) | $ / shares 22.45
Vested (in dollars per share) | $ / shares 15.63
Granted (in dollars per share) | $ / shares 38.40
Balance at the end of the period (in dollars per share) | $ / shares $ 25.93