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Commitments (Details Narrative) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
Rent Expense $ 11,200 $ 10,700 $ 9,900
Royalty expense, percentage of net sales 6.70% 7.30% 7.20%
Royalty Expense $ 39,600 $ 37,800 $ 33,800