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Accounts Receivable, net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Net Accounts Receivables    
Trade receivables $ 87,475 $ 87,303
Other 965 1,003
Receivable Gross 88,440 88,306
Allowance for doubtful accounts (916) (955)
Accounts receivable, net $ 87,524 $ 87,351