Equity - Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Numerator:
Income from continuing operations, net of income taxes	$ 35,545	$ 49,252	$ 73,120	$ 80,873
Income (loss) from discontinued operations, net of income taxes	12	(7)	(14)	(14)
Less: Net income attributable to noncontrolling interests	350	736	756	809
Net income attributable to common shareholders	$ 35,207	$ 48,509	$ 72,350	$ 80,050
Denominator:
Weighted-average shares outstanding—Basic (in shares)	47,061	46,675	46,852	46,712
Effect of dilutive securities:
Stock options, restricted stock units, performance share units and restricted stock (in shares)	858	875	939	1,006
Weighted-average shares outstanding—Diluted (in shares)	47,919	47,550	47,791	47,718