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Commitments (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Rent Expense $ 9.9 $ 10.1 $ 10.8
Royalty expense, percentage of net sales 7.20% 7.10% 7.20%
Royalty Expense $ 33.8 $ 35.6 $ 40.5