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Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Bad Debt Expense Related To Toys R Us   $ 18,000 $ 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     92.00% 95.00%  
Activities necessary to fulfill obligation to transfer products to customers included in selling, distribution and administration expense $ 55,029 $ 57,725 $ 138,916 $ 131,809  
Deferred revenues recorded as liabilities $ 43,653   $ 43,653   $ 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     6.00% 5.00%