Quarterly report pursuant to Section 13 or 15(d)

Accounts Receivable, net (Details)

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Accounts Receivable, net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Accounts receivable, net    
Gross accounts receivable $ 119,310 $ 111,637
Allowance for doubtful accounts (10,975) (9,932)
Total accounts receivable, net $ 108,335 $ 101,705