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ACQUISITIONS ASSETS ACQUIRED (TABLES) (Details) - USD ($) $ in Thousands | Apr. 08, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Nov. 04, 2020 | Aug. 05, 2020 | Feb. 07, 2020
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Operating lease assets |  | $ 97,866 | $ 120,820 |  |  |
Goodwill |  | 736,398 | 363,502 |  |  |
Operating lease liability - short-term |  | 42,643 | 43,651 |  |  |
Accrued employee compensation and benefits |  | 174,272 | 163,658 |  |  |
Operating lease liability - long-term |  | $ 73,172 | $ 98,277 |  |  |
Avtex |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash | $ 18,638 |  |  |  |  |
Accounts receivable. | 22,727 |  |  |  |  |
Prepaid Expenses | 26,357 |  |  |  |  |
Other assets | 480 |  |  |  |  |
Operating lease assets | 3,614 |  |  |  |  |
Income Taxes Receivable | 93 |  |  |  |  |
Fixed Assets Acquired | 3,162 |  |  |  |  |
Goodwill | 375,669 |  |  |  |  |
Total assets acquired | 581,470 |  |  |  |  |
Accounts payable | 20,962 |  |  |  |  |
Operating lease liability - short-term | 678 |  |  |  |  |
Accrued employee compensation and benefits | 4,325 |  |  |  |  |
Accrued income taxes | 332 |  |  |  |  |
Accrued expenses | 250 |  |  |  |  |
Operating lease liability - long-term | 2,936 |  |  |  |  |
Deferred tax liabilities | 11 |  |  |  |  |
Deferred revenue. | 52,031 |  |  |  |  |
Total liabilities assumed | 81,525 |  |  |  |  |
Total purchase price | 499,945 |  |  |  |  |
Avtex | Trade Names [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets | 5,300 |  |  |  |  |
Avtex | Intellectual Property [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets | 770 |  |  |  |  |
Avtex | Customer Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets | $ 124,660 |  |  |  |  |
VoiceFoundry US |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Accounts receivable. |  |  |  |  | $ 3,758 |
Prepaid Expenses |  |  |  |  | 345 |
Goodwill |  |  |  |  | 35,881 |
Total assets acquired |  |  |  |  | 47,084 |
Accounts payable |  |  |  |  | 289 |
Accrued employee compensation and benefits |  |  |  |  | 741 |
Deferred revenue. |  |  |  |  | 170 |
Total liabilities assumed |  |  |  |  | 1,200 |
Total purchase price |  |  |  |  | 45,884 |
VoiceFoundry US | Trade Names [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  |  | 400 |
VoiceFoundry US | Noncompete Agreements [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  |  | 150 |
VoiceFoundry US | Customer Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 6,550 |
VoiceFoundry ASEAN |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  | $ 1,300 |  |
Accounts receivable. |  |  |  | 937 |  |
Prepaid Expenses |  |  |  | 115 |  |
Property, plant and equipment. |  |  |  | 274 |  |
Income Taxes Receivable |  |  |  | 30 |  |
Goodwill |  |  |  | 14,418 |  |
Total assets acquired |  |  |  | 20,474 |  |
Accounts payable |  |  |  | 960 |  |
Accrued employee compensation and benefits |  |  |  | 113 |  |
Deferred tax liabilities |  |  |  | 1,013 |  |
Deferred revenue. |  |  |  | 236 |  |
Other accrued assets liabilities, net |  |  |  | (78) |  |
Total liabilities assumed |  |  |  | 2,244 |  |
Total purchase price |  |  |  | 18,230 |  |
VoiceFoundry ASEAN | Trade Names [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  | 300 |  |
VoiceFoundry ASEAN | Customer Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  | $ 3,100 |  |
Serendebyte |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  |  |  | $ 3,123
Accounts receivable. |  |  |  |  |  | 1,243
Prepaid Expenses |  |  |  |  |  | 1,327
Property, plant and equipment. |  |  |  |  |  | 20
Deferred tax assets. |  |  |  |  |  | 14
Goodwill |  |  |  |  |  | 9,033
Total assets acquired |  |  |  |  |  | 17,080
Accounts payable |  |  |  |  |  | 120
Accrued employee compensation and benefits |  |  |  |  |  | 1,025
Accrued income taxes |  |  |  |  |  | 170
Accrued expenses |  |  |  |  |  | 2,208
Deferred tax liabilities |  |  |  |  |  | 629
Total liabilities assumed |  |  |  |  |  | 4,152
Total purchase price |  |  |  |  |  | 12,928
Serendebyte | Trade Names [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 400
Serendebyte | Customer Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 1,920

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