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Receivables (Tables)
 12 Months Ended
Dec. 31, 2013
Receivables  
Schedule of receivables

Receivables are summarized as follows (in thousands):

 
   December 31,  
 
   2013   2012  

Trade receivables

   $ 150,394   $ 154,081  

Tax receivables

     127,130     83,203  

Other receivables

     5,517     25,050  

Less: Allowance for losses

     (1,278 )   (5,367 )
           
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Receivables, net

   $ 281,763   $ 256,967  
           
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