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Related Party Transactions (Details 1) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Related party transactions entered into for the time periods presented    
Sales and service fee revenues$ 183,269$ 119,510$ 611,125$ 353,641
Purchases of product174,864108,233462,988323,304
Lease income1,4451,4134,1124,232
Labor and benefits reimbursement2,7302,6548,1148,053
Other expenses59 104 
Accounts receivable at September 308,61515,1368,61515,136
Accounts payable at September 30$ 18,857$ 18,229$ 18,857$ 18,229