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GOODWILL (GOODWILL ROLLFORWARD) (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Goodwill [Line Items] |
Beginning balance, goodwill | $ 206,694
Acquisitions / Adjustments | 1,097
Effect of Foreign Currency | (4,273)
Ending balance, goodwill | 203,518
Customer Management Services [Member] |
Goodwill [Line Items] |
Beginning balance, goodwill | 119,497
Acquisitions / Adjustments | (125)
Effect of Foreign Currency | (3,849)
Ending balance, goodwill | 115,523
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 | 1,222
Effect of Foreign Currency | (49)
Ending balance, goodwill | 42,012
Customer Strategy Services [Member] |
Goodwill [Line Items] |
Beginning balance, goodwill | 21,919
Effect of Foreign Currency | (375)
Ending balance, goodwill | $ 21,544

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