INCOME TAXES - Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Deferred Tax Asset Valuation Allowance
Balance at Beginning of Period	$ 1,373	$ 1,263	$ 765
Balance at End Period	109,531	1,373	1,263
Charged (Benefit) to Costs and Expenses
Change in Deferred Tax Asset Valuation Allowance
Deferred tax asset, additions	15,395	110	498
Charged to Other Accounts
Change in Deferred Tax Asset Valuation Allowance
Deferred tax asset, additions	$ 92,763	$ 0	$ 0