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Earnings Per Share (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Basic earnings per common share:
Net income attributable to the Company	$ 21,181us-gaap_NetIncomeLoss	$ 16,075us-gaap_NetIncomeLoss	$ 16,748us-gaap_NetIncomeLoss	$ 19,311us-gaap_NetIncomeLoss	$ 18,805us-gaap_NetIncomeLoss	$ 14,276us-gaap_NetIncomeLoss	$ 17,150us-gaap_NetIncomeLoss	$ 19,306us-gaap_NetIncomeLoss	$ 73,315us-gaap_NetIncomeLoss	$ 69,537us-gaap_NetIncomeLoss	$ 61,660us-gaap_NetIncomeLoss
Increase in noncontrolling interest redemption value									(44)	(510)
Net income attributable to participating securities									(402)	(530)
Net income attributable to common shareholders									72,869	68,497	61,660
Weighted average common shares outstanding									40,960,000	43,387,000	46,916,000
Basic earnings per common share	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.43us-gaap_EarningsPerShareBasic	$ 1.78us-gaap_EarningsPerShareBasic	$ 1.58us-gaap_EarningsPerShareBasic	$ 1.31us-gaap_EarningsPerShareBasic
Diluted earnings per common share:
Net income attributable to common shareholders									$ 72,869	$ 68,497	$ 61,660
Weighted average common shares outstanding									40,960,000	43,387,000	46,916,000
Dilutive effect of outstanding equity awards									758,000	856,000	894,000
Diluted weighted average common shares outstanding									41,718,000	44,243,000	47,810,000
Diluted earnings per common share	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 1.75us-gaap_EarningsPerShareDiluted	$ 1.55us-gaap_EarningsPerShareDiluted	$ 1.29us-gaap_EarningsPerShareDiluted
Weighted average antidilutive awards excluded from computation of earnings per share									226,000	129,000	0