Calculation of Earnings Per Share (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014
Basic earnings per common share:
Net income attributable to the Company	$ 22,236us-gaap_NetIncomeLoss	$ 19,311us-gaap_NetIncomeLoss
Decrease (increase) in noncontrolling interest redemption value	70	(8)
Net income attributable to participating securities	(100)	(137)
Net income attributable to common shareholders	22,206	19,166
Weighted average common shares outstanding	39,827	41,778
Basic earnings per common share	$ 0.56us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic
Diluted earnings per common share:
Net income attributable to common shareholders	$ 22,206	$ 19,166
Weighted average common shares outstanding	39,827	41,778
Dilutive effect of outstanding equity awards	683	918
Diluted weighted average common shares outstanding	40,510	42,696
Diluted earnings per common share	$ 0.55us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted
Weighted average antidilutive awards excluded from computation of earnings per share	112	102

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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