BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill
Number of reporting units \| item	1
Goodwill impairment \| $	$ 0	$ 0	$ 0

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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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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