RELATED PARTY TRANSACTIONS - Narrative (Details) - IAC	3 Months Ended
Mar. 31, 2021 USD ($)
Leasing Arrangements
Related Party Transaction
Received from affiliate	$ 100,000
Paid to affiliate	200,000
Due from affiliates	0
Tax Sharing Agreement
Related Party Transaction
Due to affiliate	2,000,000.0
Tax Sharing Agreement \| Other Current Assets
Related Party Transaction
Due from affiliates	1,800,000
Tax Sharing Agreement \| Other Non-current Assets
Related Party Transaction
Due from affiliates	600,000
Transition Services Agreement
Related Party Transaction
Received from affiliate	100,000
Paid to affiliate	100,000
Equity Award Transactions
Related Party Transaction
Paid to affiliate	100,000
Health and Welfare and 401(k) Plans
Related Party Transaction
Paid to affiliate	100,000
Accrued employee benefits	$ 1,800,000

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them.

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