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ACCOUNTS RECEIVABLE NET (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Receivable, Net [Abstract]    
Trade receivables $ 50,876 $ 35,482
Unbilled revenue 12,372 6,347
Other receivables 6,198 1,250
Accounts receivable, gross 69,446 43,079
Less: Allowance for doubtful accounts (287) (359)
Accounts receivable, net $ 69,159 $ 42,720