STOCK PLANS - Activity (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 25, 2017 USD ($) $ / shares shares
RSUs
RSU's
Nonvested at the beginning of the period (in shares) | shares	204,145
Granted (in shares) | shares	196,905
Vested (in shares) | shares	(129,746)
Forfeited (in shares) | shares	(450)
Nonvested at the end of the period (in shares) | shares	270,854
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 18.17
Granted (in dollars per share) | $ / shares	10.74
Vested (in dollars per share) | $ / shares	20.09
Forfeited (in dollars per share) | $ / shares	19.40
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 11.84
Additional disclosures
Total fair value | $	$ 1.5
Stock options and SARs
Options/SARs
Outstanding at the beginning of the period (in shares) | shares	292,750
Expired (in shares) | shares	(72,450)
Outstanding at the end of the period (in shares) | shares	220,300
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 50.29
Expired (in dollars per share) | $ / shares	41.73
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 53.10