Income Taxes - Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Current:
Federal	$ 28,951	$ 32,477	$ 36,077
Foreign	4,602	2,669	4,183
State and local	(234)	2,947	3,169
Deferred:
Deferred	498	11,624	(6,246)
Total	$ 33,817	$ 49,717	$ 37,183