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COST OF REVENUE (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
COST OF REVENUE        
Compensation and benefits $ 28,840 $ 22,497 $ 84,314 $ 59,296
Outside fees and services 31,084 21,528 91,494 57,221
Reimbursable expenses 24,326 21,834 77,846 56,934
Technology and communications 6,900 5,904 17,890 13,439
Depreciation and amortization 3,137 1,576 7,241 4,495
Total $ 94,287 $ 73,339 $ 278,785 $ 191,385