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GOODWILL (GOODWILL ROLLFORWARD) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Goodwill [Line Items] |
Beginning balance, goodwill | $ 206,694
Acquisitions / Adjustments | 1,337
Effect of Foreign Currency | (6,205)
Ending balance, goodwill | 201,826
Customer Management Services [Member] |
Goodwill [Line Items] |
Beginning balance, goodwill | 119,497
Acquisitions / Adjustments | (125)
Effect of Foreign Currency | (5,586)
Ending balance, goodwill | 113,786
Customer Growth Services [Member] |
Goodwill [Line Items] |
Beginning balance, goodwill | 24,439
Ending balance, goodwill | 24,439
Customer Technology Services [Member] |
Goodwill [Line Items] |
Beginning balance, goodwill | 40,839
Acquisitions / Adjustments | 1,462
Effect of Foreign Currency | (78)
Ending balance, goodwill | 42,223
Customer Strategy Services [Member] |
Goodwill [Line Items] |
Beginning balance, goodwill | 21,919
Effect of Foreign Currency | (541)
Ending balance, goodwill | $ 21,378

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