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Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Bad Debt Expense Related To Toys R Us     $ 59,115    
Accounting Standards Update 2014-09 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Percentage of Revenues from Sales of Finished Products     91.00% 93.00%  
Activities necessary to fulfill obligation to transfer products to customers included in selling, distribution and administration expense $ 42,400 $ 37,500 $ 83,900 $ 74,100  
Deferred revenues recorded as liabilities $ 41,380   $ 41,380   $ 10,261
Accounting Standards Update 2014-09 [Member] | Entertainment and Licensing [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Percentage of Revenues from Segment     8.00% 6.00%