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ROYALTY EXPENSE (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Royalty Expense [Abstract]        
Royalty Expense $ 2,109 $ 2,895 $ 4,403 $ 6,120