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ROYALTY EXPENSE (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Royalty Expense [Abstract]        
Royalty Expense $ 3,295 $ 2,652 $ 7,018 $ 5,001