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SHARE-BASED COMPENSATION (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
SHARE-BASED COMPENSATION        
Share-based compensation expense $ 1,332 $ 1,731 $ 5,696 $ 5,134
Income tax benefit (575) (762) (2,216) (2,249)
Total share-based compensation expense, net of tax 757 969 3,480 2,885
Direct cost of services
       
SHARE-BASED COMPENSATION        
Share-based compensation expense 20 65 640 186
Selling, general and administrative
       
SHARE-BASED COMPENSATION        
Share-based compensation expense $ 1,312 $ 1,666 $ 5,056 $ 4,948