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RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES (LIABILITY ROLLFORWARD TABLE) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]    
Beginning balance, restructuring reserve $ 325 $ 3,642
Expense 3,264 1,751
Payments (2,796) (2,107)
Changes due to foreign currency (16) (40)
Change in estimates (78) (4)
Reclassifications due to ASU 842 implementation   (2,917)
Ending balance, restructuring reserve 699 325
Reduction in Force [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance, restructuring reserve 251 416
Expense 1,064 1,039
Payments (1,067) (1,145)
Changes due to foreign currency (14) (55)
Change in estimates (78) (4)
Ending balance, restructuring reserve 156 251
Closure of Delivery Centers [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance, restructuring reserve 74 3,226
Expense 2,200 712
Payments (1,729) (962)
Changes due to foreign currency (2) 15
Reclassifications due to ASU 842 implementation   (2,917)
Ending balance, restructuring reserve $ 543 $ 74