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Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts Receivable, Net [Abstract]    
Trade receivables $ 57,385 $ 50,876
Unbilled revenue 20,969 12,372
Other receivables 5,001 6,198
Accounts receivable, gross 83,355 69,446
Less: Allowance for doubtful accounts (274) (287)
Accounts receivable, net $ 83,081 $ 69,159