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EQUITY-BASED COMPENSATION PLANS (NARRATIVE) (DETAILS) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Equity-based compensation expense $ 2,700 $ 3,300 $ 7,278 $ 8,569
Restricted Stock Units (RSUs) [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Equity-based compensation expense 2,600 3,200 7,200 $ 8,300
Unrecognized Compensation Expense 22,000   $ 22,000  
Non-option Equity Awards Granted     443,875 744,800
Cost of Services        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Equity-based compensation expense 1,000 900 $ 2,300 $ 2,000
Selling General And Administrative Expenses [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Equity-based compensation expense $ 1,700 $ 2,400 $ 5,000 $ 6,600