Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - 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 interest expense	$ 2,566	$ 1,756	$ 6,135	$ 4,876
Income tax effects	8,280	8,977	30,728	33,423
Qualifying as hedges | Interest rate swap | Amount reclassified from AOCI
Consolidated Statements of Comprehensive Income (Unaudited)
Net interest expense	54	296	378	924
Income tax effects	$ 20	$ 110	$ 140	$ 342