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, 2013
Dec. 31, 2012
Accounts receivable, net    
Gross accounts receivable $ 121,783 $ 117,853
Allowance for doubtful accounts (13,908) (11,711)
Total accounts receivable, net $ 107,875 $ 106,142