ACQUISITIONS ASSETS ACQUIRED (TABLES) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Aug. 05, 2020	Feb. 07, 2020	Dec. 31, 2019	Oct. 26, 2019
Business Acquisition [Line Items]
Operating lease assets	$ 132,571			$ 150,808
Goodwill	345,119			301,694
Operating lease liability - short-term	44,181			45,218
Accrued employee compensation and benefits	164,548			114,165
Operating lease liability - long-term	$ 106,921			$ 127,395
Voice Foundry US
Business Acquisition [Line Items]
Accounts receivable.		$ 3,758
Prepaid Expenses		345
Goodwill		35,891
Total assets acquired		47,094
Accounts payable		289
Accrued employee compensation and benefits		741
Deferred revenue.		170
Total liabilities assumed		1,200
Total purchase price		45,894
Voice Foundry US | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets		400
Voice Foundry US | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Intangible assets		150
Voice Foundry US | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets		$ 6,550
Serendebyte
Business Acquisition [Line Items]
Cash			$ 3,123
Accounts receivable.			1,243
Prepaid Expenses			1,327
Property, plant and equipment.			14
Deferred tax assets			20
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
FCR
Business Acquisition [Line Items]
Cash					$ 5,225
Accounts receivable.					10,659
Prepaid Expenses					357
Property, plant and equipment.					6,006
Other assets					224
Operating lease assets					5,127
Goodwill					96,739
Total assets acquired					171,477
Accounts payable					388
Operating lease liability - short-term					1,160
Accrued employee compensation and benefits					4,049
Accrued expenses					72
Operating lease liability - long-term					3,967
Total liabilities assumed					9,636
Total purchase price					161,841
FCR | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets					8,600
FCR | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets					$ 38,540