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RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES (NARRATIVE) (DETAILS) (USD $)
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Spain [Member]
Closure of Delivery Centers [Member]
Jun. 30, 2012
Spain [Member]
Closure of Delivery Centers [Member]
Jun. 30, 2012
Spain [Member]
Reduction in Force [Member]
Mar. 31, 2012
Customer Management Services [Member]
Dec. 31, 2012
Customer Management Services [Member]
Dec. 31, 2011
Customer Management Services [Member]
Dec. 31, 2010
Customer Management Services [Member]
Asset Impairment [Line Items]                    
Impairment of leasehold improvements               $ 1,200,000 $ 200,000 $ 1,400,000
Impairment of trade name             1,800,000      
Restructuring Cost and Reserve [Line Items]                    
Restructuring Reserve 4,079,000 2,067,000 8,962,000 1,600,000 400,000 14,700,000        
Payments $ (20,863,000) $ (10,546,000)   $ 13,500,000