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Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts receivable, Net    
Trade accounts receivable $ 137,405 $ 125,787
Unbilled revenue 67,966 41,005
Total accounts receivable 205,371 166,792
Allowance for doubtful accounts (12,153) (11,819)
Accounts receivable, net $ 193,218 $ 154,973