CUSTOMER RECEIVABLES, NET

12 Months Ended

Dec. 31, 2011

CUSTOMER RECEIVABLES, NET

CUSTOMER RECEIVABLES, NET

4. CUSTOMER RECEIVABLES, NET

        Customer receivables are presented net of an allowance for doubtful accounts of $4.2 million and $3.6 million at December 31, 2011 and 2010, respectively. Management performs ongoing credit evaluations of its clients and generally does not require collateral. As of December 31, 2011 and 2010, the U.S. government and agencies thereof, represented approximately 18.8% and 21.2%, respectively, of gross customer receivables.