Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Basic earnings per common share:
Net income attributable to the Company	$ 23,538	$ 22,541	$ 51,966	$ 48,723
Change in noncontrolling interest redemption value	662	279	1,182	499
Net income attributable to participating securities	(99)	(91)	(216)	(201)
Net income attributable to common shareholders	$ 24,101	$ 22,729	$ 52,932	$ 49,021
Weighted average common shares outstanding	36,732	37,203	36,771	37,567
Basic earnings per common share	$ 0.66	$ 0.61	$ 1.44	$ 1.30
Diluted earnings per common share:
Net income attributable to common shareholders	$ 24,101	$ 22,729	$ 52,932	$ 49,021
Weighted average common shares outstanding	36,732	37,203	36,771	37,567
Dilutive effect of outstanding equity awards	485	304	512	337
Diluted weighted average common shares outstanding	37,217	37,507	37,283	37,904
Diluted earnings per common share	$ 0.65	$ 0.61	$ 1.42	$ 1.29
Weighted average antidilutive awards excluded from computation of earnings per share	325	689	215	566