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ROYALTY EXPENSE (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Royalty Expense [Abstract]        
Royalty Expense $ 2,652 $ 2,350 $ 5,001 $ 5,267