Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Basic earnings per common share:
Net income attributable to the Company	$ 21,467	$ 17,971	$ 70,190	$ 50,987
Change in noncontrolling interest redemption value	(157)	49	342	192
Net income attributable to participating securities	(87)	(73)	(288)	(223)
Net income attributable to common shareholders	$ 21,223	$ 17,947	$ 70,244	$ 50,956
Weighted average common shares outstanding	36,989	39,394	37,374	39,640
Basic earnings per common share	$ 0.57	$ 0.46	$ 1.88	$ 1.29
Diluted earnings per common share:
Net income attributable to common shareholders	$ 21,223	$ 17,947	$ 70,244	$ 50,956
Weighted average common shares outstanding	36,989	39,394	37,374	39,640
Dilutive effect of outstanding equity awards	370	501	338	570
Diluted weighted average common shares outstanding	37,359	39,895	37,712	40,210
Diluted earnings per common share	$ 0.57	$ 0.45	$ 1.86	$ 1.27
Weighted average antidilutive awards excluded from computation of earnings per share	22	219	598	234