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ACQUISITIONS AND DIVESTITURES (NARRATIVE) (Details) £ in Millions |  |  |  |  |  |  | 3 Months Ended |  |
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Apr. 30, 2018 GBP (£) | Apr. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 22, 2017 USD ($) | Nov. 08, 2017 USD ($) | Apr. 03, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Apr. 30, 2018 USD ($) | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities, noncurrent |  |  | $ 97,121,000 |  |  |  |  | $ 97,121,000 | $ 95,243,000 |  |  |  |  |  |
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |
Contingent Consideration, at fair value |  |  |  |  |  |  |  |  | 399,000 |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  |  |  | $ 384,000,000 |  |  |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax |  |  |  |  |  |  |  |  |  |  | 19,000,000 |  |  |  |
Investments in non-marketable equity investments |  |  |  |  |  |  |  | 2,119,000 |  |  | 1,153,000 |  |  |  |
Technology Solutions Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  |  |  | 141,000 |  | $ 250,000 |  |  |  |  |
Gain on sale of business |  |  |  |  |  |  |  |  |  | 30,000 |  |  |  |  |
TeleTech Spain Holdings SL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other nonoperating income expense |  |  |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  |
Customer Growth Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  | $ 245,000 |  |  |  |  | $ 600,000 |  |  |  |  |  |
Non-cash loss on assets held-for-sale |  |  |  |  |  |  | $ 2,600,000 |  |  | $ 3,200,000 |  |  |  |  |
Customer Strategy Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash loss on assets held-for-sale |  |  |  |  |  |  | $ 2,700,000 |  |  |  |  |  |  |  |
BH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  | Mar. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  | Berkshire Hathaway Specialty ConciergeOn March 31, 2018, the Company, through its subsidiary Percepta, acquired certain assets from Berkshire Hathaway Specialty Concierge, LLC ("BH") related to a customer engagement center and the related customer contracts. This acquisition is being accounted for as a business combination. These assets will be integrated into the Customer Management Services ("CMS") segment. |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  | $ 1 |  |  |  |  | 1 |  |  |  |  |  |  |
BH | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Assets Acquired |  |  | 257,000 |  |  |  |  |  |  |  |  |  |  |  |
BH | Lease Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Assets Acquired |  |  | 330,000 |  |  |  |  |  |  |  |  |  |  |  |
BH | Fixed Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Assets Acquired |  |  | 98,000 |  |  |  |  |  |  |  |  |  |  |  |
Motif [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  |  |  | Nov. 08, 2017 |  |  |  |  |  |  |  |  |  |
Percentage of Voting Interests Acquired |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  |  |  | MotifOn November 8, 2017, the Company agreed to acquire all of the outstanding shares in 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. Motif will be integrated into the Customer Management Services ("CMS") segment. |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses |  |  |  |  | $ 46,800,000 |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | 5,997,000 |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  | $ 73,438,000 |  |  |  |  |  |  |  |  |  |
Other liabilities, noncurrent |  |  | $ 29,800,000 |  |  |  |  | 29,800,000 |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 11 years |  |  |  |  |  |  |  |  |  |
Connextions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  |  |  |  | Apr. 03, 2017 |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  | $ 77,712,000 |  |  |  |  |  |  |  |  |
Payments for Previous Acquisition |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |
Proceeds from Previous Acquisition |  |  |  |  |  |  |  | $ 4,100,000 |  |  |  |  |  |  |
Connextions | Customer Management Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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. |  |  |  |  |  |  |  |  |
Connextions | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  | 12 years |  |  |  |  |  |  |  |  |
CafeX [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 17.20% |  |  |  |  | 17.20% |  |  |  |  |  |  | 17.20%
Investments in non-marketable equity investments |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 | $ 3,200,000 | $ 9,000,000 |  |
SCS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity | On April 30, 2018, the Company agreed to acquire all of the outstanding shares in Strategic Communications Services, Ltd ("SCS"). SCS provides services as a system integrator for omnichannel contact center platforms, including CISCO. The Company offers in-house, managed and outsourced network, information, communications and contact center services to leading brands throughout Europe. | On April 30, 2018, the Company agreed to acquire all of the outstanding shares in Strategic Communications Services, Ltd ("SCS"). SCS provides services as a system integrator for omnichannel contact center platforms, including CISCO. The Company offers in-house, managed and outsourced network, information, communications and contact center services to leading brands throughout Europe. |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses | £ 4.4 | $ 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,200,000 |
SCS | United Kingdom, Pounds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | £ | 3.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration, at Fair Value, Current Portion | £ | £ 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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