EQUITY-BASED COMPENSATION PLANS (NARRATIVE) (DETAILS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 2,600	$ 2,700	$ 5,278	$ 5,881
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	2,500	2,600	5,100	$ 5,700
Unrecognized Compensation Expense	23,200		$ 23,200
Non-option Equity Awards Granted			169,252	210,176
Cost of Services [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	500	500	$ 1,100	$ 1,100
Selling General And Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 2,100	$ 2,200	$ 4,200	$ 4,800