EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Numerator [Abstract]
Net earnings attributable to controlling interest	$ 25,976	$ 21,789	$ 36,138	$ 29,004
Adjustment for earnings allocated to non-vested restricted common stock	(347)	(209)	(462)	(266)
Net earnings for calculating EPS	$ 25,629	$ 21,580	$ 35,676	$ 28,738
Denominator [Abstract]
Weighted average shares outstanding (in shares)	20,198,000	20,137,000	20,147,000	20,097,000
Adjustment for non-vested restricted common stock (in shares)	(270,000)	(193,000)	(258,000)	(184,000)
Shares for calculating basic EPS (in shares)	19,928,000	19,944,000	19,889,000	19,913,000
Effect of dilutive stock options (in shares)	33,000	20,000	33,000	21,000
Shares for calculating diluted EPS (in shares)	19,961,000	19,964,000	19,922,000	19,934,000
Net earnings per share [Abstract]
Basic (in dollars per share)	$ 1.29	$ 1.08	$ 1.79	$ 1.44
Diluted (in dollars per share)	$ 1.28	$ 1.08	$ 1.79	$ 1.44
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares excluded from computation of EPS (in shares)	0	0