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Accounts Receivable and Allowance for Doubtful Accounts (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Summary of accounts receivable    
Accounts receivable $ 27,086 $ 29,468
Allowance for doubtful accounts (818) (1,894)
Accounts receivable, net $ 26,268 $ 27,574