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ROYALTY EXPENSE (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Royalty Expense [Abstract]        
Royalty Expense $ 2,121 $ 3,675 $ 8,241 $ 11,246