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RESTRUCTURING AND INTEGRATION CHARGES AND IMPAIRMENT LOSSES (LIABILITY CLASSIFICATION TABLE) (DETAILS) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction in force |  |  |  |  |  |  |  |  | $ 1,161 | $ 3,400 | $ 1,814
Facility exit charges |  |  |  |  |  |  |  |  | 2,219 | 992 |
Restructuring charges, net | $ 4,897 | $ 6,006 | $ 3,593 | $ 169 | $ 502 | $ 3,688 | $ 114 | $ 88 | 14,665 | 4,392 | 1,814
Customer Management Services |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction in force |  |  |  |  |  |  |  |  | 1,012 | 2,837 | 1,482
Facility exit charges |  |  |  |  |  |  |  |  | 2,050 | 959 | 0
Customer Growth Services |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction in force |  |  |  |  |  |  |  |  |  | 147 | 22
Facility exit charges |  |  |  |  |  |  |  |  | 0 | 0 | 0
Customer Technology Services |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction in force |  |  |  |  |  |  |  |  | 94 | 324 | 13
Facility exit charges |  |  |  |  |  |  |  |  | 84 | 33 | 0
Customer Strategy Services |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction in force |  |  |  |  |  |  |  |  | 55 | 92 | 297
Facility exit charges |  |  |  |  |  |  |  |  | $ 85 | $ 0 | $ 0

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