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ACQUISITIONS AND DIVESTITURES (NARRATIVE) (DETAILS) $ in Thousands, $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 08, 2017 USD ($) | Apr. 03, 2017 USD ($) | Nov. 09, 2016 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 09, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities, noncurrent |  |  |  |  | $ 95,243 |  |  | $ 71,664 |  |  |  |  | $ 95,243 | $ 71,664 |  |
Contingent Consideration, at fair value |  |  |  |  | 399 |  |  | 1,808 |  | $ 13,450 |  |  | 399 | 1,808 | $ 13,450 |
Revenue of Acquirees since Acquisition Date, Actual |  |  |  |  |  |  |  |  |  |  |  |  | 172,300 | 10,000 |  |
Income (loss) from operations of Acquirees since Acquisition Date, Actual |  |  |  |  |  |  |  |  |  |  |  |  | (700) | (300) |  |
Proceeds from sale of business |  |  |  |  |  |  |  |  |  |  |  |  | 636 | 0 | 0 |
Gain on sale of business |  |  |  |  |  |  |  |  |  |  |  |  | 908 | 0 | 0 |
Other nonoperating income expense |  |  |  |  |  |  |  |  |  |  |  |  | 1,869 | 9,555 | 2,157 |
Business Combination Pro Forma Information Amortization Expense of Acquirees Since Acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 3,500 | 100 |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,541,600 | 1,489,100 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax |  |  |  |  |  |  |  |  |  |  |  |  | 11,500 | 31,100 |  |
Investments in non-marketable equity investments |  |  |  |  |  |  |  |  |  |  |  |  | 1,384 | 3,179 | 9,000 |
Motif [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Voting Interests Acquired | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity | Motif, Inc., a California corporation ("Motif"). Motif is a digital trust and safety services company serving eCommerce marketplaces, online retailers, travel agencies and financial services companies. Motif provides omni-channel community moderation services via voice, email and chat from delivery centers in India and the Philippines via approximately 2,700 employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses | $ 46,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | $ 73,438 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities, noncurrent |  |  |  |  | 27,800 |  |  |  |  |  |  |  | $ 27,800 |  |  |
Contingent Consideration Arrangements, Basis for Amount | The Company also agreed to purchase the remaining 30% interest in Motif from Motif's founders ("founders' shares") no later than May 2020 ("30% buyout period"). The Company agreed to pay for the founders' shares at a purchase price based on Motif's fiscal year 2020's adjusted normalized EBITDA, $5.0 million in cash, and 30% of the excess cash present in the business at the time of the buyout; or if the buyout occurs prior to May 2020, the trailing twelve months EBITDA, calculated from the most recently completed full monthly period ending prior to the date of the buyout triggering event, $5.0 million in cash, and 30% of the excess cash in the business at that point. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Motif [Member] | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 11 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Connextions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  | Connextions, Inc., a health care customer service provider company, from OptumHealth Holdings, LLC. Connextions is being integrated into the health care vertical of the CMS segment of the Company. Connextions employed approximately 2,000 at several centers in the U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses |  | $ 80,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | $ 77,712 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Previous Acquisition |  |  |  |  |  | $ 1,800 |  |  |  |  |  |  |  |  |  |
Proceeds from Previous Acquisition |  |  |  |  |  | $ 4,100 |  |  |  |  |  |  |  |  |  |
Connextions | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Atelka [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  | Nov. 09, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  | On November 9, 2016, the Company acquired all of the outstanding shares of Atelka Enterprise Inc. ("Atelka"), a Canadian customer contact center management and business process outsourcing services company that serves Canadian telecommunications, logistics, and entertainment clients. This acquisition was an addition to the CMS segment. Atelka employs approximately 2,800 in Quebec, Ontario, New Brunswick and Prince Edward Island. |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,401
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,500
Acquisition hold-back payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |
Contingent Consideration, at fair value |  |  |  |  | 0 |  |  | 558 |  | 0 |  |  | $ 0 | 558 | 0 |
Increase (decrease) in contingent consideration payable |  |  |  |  | $ 600 |  |  |  |  |  |  |  |  |  |  |
Atelka [Member] | CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  | $ 65.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contingent consideration payable |  |  |  | $ 0.8 |  |  |  |  |  |  |  |  |  |  |  |
Atelka [Member] | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |
rogenSi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.60% |  |  |
Contingent Consideration, at fair value |  |  |  |  |  |  |  | 0 |  | 9,797 |  |  |  | 0 | 9,797 |
Increase (decrease) in contingent consideration payable |  |  |  |  |  |  |  |  | $ 4,300 | 300 | $ 800 |  |  |  |  |
Sofica [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Contingent Consideration, at fair value |  |  |  |  |  |  |  | $ 0 |  | $ 3,153 |  |  |  | $ 0 | $ 3,153 |
Increase (decrease) in contingent consideration payable |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |
CafeX [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 17.20% |  |  | 17.20% |  |  |  |  | 17.20% | 17.20% |  |
Investments in non-marketable equity investments |  |  |  |  |  |  | $ 1,100 | $ 4,300 |  |  |  |  |  |  |  |

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