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ROYALTY EXPENSE (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Royalty Expense [Abstract]        
Royalty Expense $ 3,830 $ 3,295 $ 7,571 $ 7,018