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EQUITY-BASED COMPENSATION PLANS (NARRATIVE) (DETAILS) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Equity-based compensation expense $ 3,191,000 $ 3,388,000
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 500,000  
Restricted Stock Units (RSUs) [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Equity-based compensation expense 3,100,000 3,300,000
Unrecognized Compensation Expense 24,300,000  
Non-option Equity Awards Granted 122,000 438,500
Cost of Services [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Equity-based compensation expense 500,000 500,000
Selling General And Administrative Expenses [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Equity-based compensation expense $ 2,700,000 $ 2,900,000