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SHARE-BASED COMPENSATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
SHARE-BASED COMPENSATION    
Pre-tax share-based compensation expense $ 1,621us-gaap_AllocatedShareBasedCompensationExpense $ 3,539us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit (681)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (1,541)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total share-based compensation expense, net of tax 940us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 1,998us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Direct cost of services    
SHARE-BASED COMPENSATION    
Pre-tax share-based compensation expense 89us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 19us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Selling, general and administrative expense    
SHARE-BASED COMPENSATION    
Pre-tax share-based compensation expense $ 1,532us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 3,520us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember