Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2017	Sep. 25, 2016	Sep. 24, 2017	Sep. 25, 2016
Consolidated Statements of Comprehensive Income (Unaudited)
Net income before attribution to noncontrolling interests	$ 22,669	$ 22,650	$ 77,550	$ 74,813
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	2,894	(2,038)	4,315	(5,551)
Interest rate swaps	641	210	(1,684)	(5,839)
Other comprehensive income (loss), before tax	3,535	(1,828)	2,631	(11,390)
Income tax effect:
Foreign currency translation adjustments	(1,071)	754	(1,597)	2,054
Interest rate swaps	(237)	(78)	623	2,160
Income tax effect	(1,308)	676	(974)	4,214
Other comprehensive income (loss), net of tax	2,227	(1,152)	1,657	(7,176)
Comprehensive income before attribution to noncontrolling interests	24,896	21,498	79,207	67,637
Less: comprehensive income, redeemable noncontrolling interests	(352)	(684)	(1,891)	(2,809)
Less: comprehensive income, nonredeemable noncontrolling interests	(500)	(499)	(1,876)	(1,814)
Comprehensive income attributable to the Company	$ 24,044	$ 20,315	$ 75,440	$ 63,014