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INTANGIBLE ASSETS AND GOODWILL - Schedule of Components of Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Goodwill [Line Items]
Goodwill, gross	$ 584,298		$ 584,298
Accumulated impairment losses	(283,406)		(167,406)
Goodwill	300,892	$ 300,892	416,892
Cloud and Edge
Goodwill [Line Items]
Goodwill, gross	392,302		392,302
Accumulated impairment losses	(167,406)		(167,406)
Goodwill	224,896		224,896
IP Optical Networks
Goodwill [Line Items]
Goodwill, gross	191,996		191,996
Accumulated impairment losses	(116,000)		0
Goodwill	$ 75,996		$ 191,996

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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