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Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts Receivable, Net [Abstract]    
Trade receivables $ 58,261 $ 50,876
Unbilled revenue 24,328 12,372
Other receivables 4,666 6,198
Accounts receivable, gross 87,255 69,446
Less: Allowance for doubtful accounts (231) (287)
Accounts receivable, net $ 87,024 $ 69,159