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Cash And Cash Equivalents And Advertising Accounting Policies (Effect Of Reclassification Of Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Dec. 31, 2016
Cash and cash equivalents $ 50,215 $ 47,917 $ 37,633 $ 46,818
Accounts receivable, net $ 48,452 56,265    
As Previously Reported [Member]        
Cash and cash equivalents   21,305 12,295 14,653
Accounts receivable, net   82,877    
Reclassifications [Member]        
Cash and cash equivalents   26,612 $ 25,338 $ 32,165
Accounts receivable, net   $ (26,612)