SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES - Impairment of Goodwill, Other Intangibles and Long-lived Assets (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Goodwill impairments	$ 36,435
Long-lived asset impairments	$ 4,775

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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