Calculation of Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Basic earnings per common share:
Net income attributable to the Company	$ 10,780	$ 16,748	$ 33,016	$ 36,059
Decrease (increase) in noncontrolling interest redemption value	73	(31)	143	(39)
Net income attributable to participating securities	(50)	(81)	(150)	(218)
Net income attributable to common shareholders	$ 10,803	$ 16,636	$ 33,009	$ 35,802
Weighted average common shares outstanding	39,692	41,225	39,764	41,501
Basic earnings per common share	$ 0.27	$ 0.40	$ 0.83	$ 0.86
Diluted earnings per common share:
Net income attributable to common shareholders	$ 10,803	$ 16,636	$ 33,009	$ 35,802
Weighted average common shares outstanding	39,692	41,225	39,764	41,501
Dilutive effect of outstanding equity awards	525	745	604	831
Diluted weighted average common shares outstanding	40,217	41,970	40,368	42,332
Diluted earnings per common share	$ 0.27	$ 0.40	$ 0.82	$ 0.85
Weighted average antidilutive awards excluded from computation of earnings per share	292	284	198	176