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Consolidated Statements of Operations (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Related party transactions [Line Items]      
Gain on disposal $ 1,962 $ 0 $ 0
Manufactured products
     
Related party transactions [Line Items]      
Sales to related parties 3,663 3,806 4,144
Purchases from related parties 46,953 45,925 36,327
Distributed products
     
Related party transactions [Line Items]      
Purchases from related parties 7,484 4,056 23,458
Discontinued operation
     
Related party transactions [Line Items]      
Gain on disposal (1,962)      
Sales to related parties 400 4   
Purchases from related parties $ 417 $ 54