Calculation of Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Basic earnings per common share:
Net income attributable to the Company	$ 16,748	$ 17,150	$ 36,059	$ 36,456
Increase in noncontrolling interest redemption value	(31)		(39)
Net income attributable to participating securities	(81)		(218)
Net income attributable to common shareholders	16,636	17,150	35,802	36,456
Weighted average common shares outstanding	41,225	43,484	41,501	43,996
Basic earnings per common share	$ 0.40	$ 0.39	$ 0.86	$ 0.83
Diluted earnings per common share:
Net income attributable to common shareholders	$ 16,636	$ 17,150	$ 35,802	$ 36,456
Weighted average common shares outstanding	41,225	43,484	41,501	43,996
Dilutive effect of outstanding equity awards	745	1,016	831	1,090
Diluted weighted average common shares outstanding	41,970	44,500	42,332	45,086
Diluted earnings per common share	$ 0.40	$ 0.39	$ 0.85	$ 0.81
Antidilutive awards excluded from computation of earnings per share	284	218	176	151