EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Numerator [Abstract]
Net earnings attributable to controlling interest	$ 19,234	$ 14,091	$ 48,238	$ 35,087
Adjustment for earnings allocated to non-vested restricted common stock	(178)	(134)	(444)	(338)
Net earnings for calculating EPS	$ 19,056	$ 13,957	$ 47,794	$ 34,749
Denominator [Abstract]
Weighted average shares outstanding (in shares)	20,100	19,965	20,095	19,916
Adjustment for non-vested restricted common stock (in shares)	(186)	(190)	(186)	(192)
Shares for calculating basic EPS (in shares)	19,914	19,775	19,909	19,724
Effect of dilutive stock options (in shares)	18	25	24	39
Shares for calculating diluted EPS (in shares)	19,932	19,800	19,933	19,763
Net earnings per share [Abstract]
Basic (in dollars per share)	$ 0.96	$ 0.71	$ 2.40	$ 1.76
Diluted (in dollars per share)	$ 0.96	$ 0.71	$ 2.40	$ 1.76
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares excluded from computation of EPS (in shares)	0	0