Other - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Dec. 31, 2017	Jun. 25, 2017	Dec. 25, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 236,511	$ 182,911
Restricted cash included within other current assets	365	375
Restricted cash included within miscellaneous assets	17,769	17,650
Total cash, cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows	$ 254,645	$ 200,936	$ 222,028	$ 125,550