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ROYALTY EXPENSE (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Royalty Expense [Abstract]      
Royalty Expense $ 14,078us-gaap_RoyaltyExpense $ 14,259us-gaap_RoyaltyExpense $ 12,260us-gaap_RoyaltyExpense