EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2017	Mar. 26, 2016
Numerator:
Net earnings attributable to controlling interest	$ 21,062	$ 19,212
Adjustment for earnings allocated to non-vested restricted common stock	362	274
Net earnings for calculating EPS	$ 20,700	$ 18,938
Denominator:
Weighted average shares outstanding (in shares)	20,470	20,281
Adjustment for non-vested restricted common stock (in shares)	(351)	(290)
Shares for calculating basic EPS (in shares)	20,119	19,991
Effect of dilutive stock options (in shares)	33	29
Shares for calculating diluted EPS (in shares)	20,152	20,020
Net earnings per share
Basic (USD per share)	$ 1.03	$ 0.95
Diluted (USD per share)	$ 1.03	$ 0.95
Antidilutive securities
Options to purchase shares excluded from computation of EPS (in shares)	0	0