INCOME TAXES - Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in Deferred Tax Asset Valuation Allowance
Balance at Beginning of Period	$ 109,531	$ 1,373	$ 1,263
Balance at End Period	112,085	109,531	1,373
Charged (Benefit) to Costs and Expenses
Change in Deferred Tax Asset Valuation Allowance
Deferred tax asset, additions	1,549	15,395	110
Charged to Other Accounts
Change in Deferred Tax Asset Valuation Allowance
Deferred tax asset, additions	$ 1,005	$ 92,763	$ 0