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EQUITY-BASED COMPENSATION PLANS (NARRATIVE) (DETAILS) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Equity-based compensation expense $ 3,160,000 $ 3,191,000
Stock Options [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Equity-based compensation expense 100,000 100,000
Unrecognized Compensation Expense 200,000  
Restricted Stock Units (RSUs) [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Equity-based compensation expense 3,000,000 3,100,000
Unrecognized Compensation Expense 25,300,000  
Non-option Equity Awards Granted 164,000 122,000
Cost of Services [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Equity-based compensation expense 600,000 500,000
Selling General And Administrative Expenses [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Equity-based compensation expense $ 2,600,000 $ 2,700,000