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Other - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 24, 2017
Dec. 25, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 206,179 $ 182,911    
Restricted cash included within other current assets 651 375    
Restricted cash included within miscellaneous assets 17,560 17,650    
Total cash, cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows $ 224,390 $ 200,936 $ 262,593 $ 125,550