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PREPAID AND OTHER CURRENT ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Prepaid and Other Current Assets [Abstract]    
Prepaid supplies $ 17,413 $ 14,056
Prepaid royalty 4,299 0
Other 6,537 4,607
Prepaid and other current assets $ 28,249 $ 18,663