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RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES (NARRATIVE) (DETAILS) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]            
Impaired Long-Lived Assets Held and Used, Asset Description       During each of the periods presented, the Company evaluated the recoverability of its leasehold improvement assets at certain delivery centers.    
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value       To determine fair value, the Company used Level 3 inputs in its discounted cash flows analysis. Assumptions included the amount and timing of estimated future cash flows and assumed discount rates.    
Impairments $ 2,900     $ (7,725)    
Restructuring Reserve 806     806 $ 2,071 $ 1,353
Payments       (2,869) (2,632)  
Customer Management Services [Member]            
Restructuring Cost and Reserve [Line Items]            
Impairment of Leasehold       $ 400 $ 400 $ 100
Impairments 1,800          
Customer Growth Services [Member]            
Restructuring Cost and Reserve [Line Items]            
Impairments $ 2,800 $ 3,100        
Customer Strategy Services [Member]            
Restructuring Cost and Reserve [Line Items]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     $ 1,100