EQUITY-BASED COMPENSATION PLANS (NARRATIVE) (DETAILS) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 2,700,000	$ 3,400,000	$ 5,881,000	$ 6,577,000
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	200,000
Unrecognized Compensation Expense	100,000		100,000
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	2,600,000	3,200,000	5,700,000	6,300,000
Unrecognized Compensation Expense	23,300,000		23,300,000
Non-option Equity Awards Granted			210,176	693,055
Cost of Services [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	500,000	600,000	1,100,000	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	$ 2,200,000	$ 2,800,000	$ 4,800,000	$ 5,600,000