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EQUITY-BASED COMPENSATION PLANS (NARRATIVE) (DETAILS) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 3,400,000	$ 3,500,000	$ 6,577,000	$ 6,845,000
Non-option Equity Awards Granted			693,055	565,887
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	100,000	100,000	200,000	300,000
Unrecognized Compensation Expense	500,000		500,000
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	3,200,000	3,300,000	6,300,000	6,600,000
Unrecognized Compensation Expense	30,500,000		30,500,000
Cost of Services [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	600,000		1,000,000
Selling General And Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 2,800,000	$ 3,500,000	$ 5,600,000	$ 6,800,000