ACCOUNTS RECEIVABLE, NET - Schedule of Allowance for Doubtful Accounts and Expected Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Allowance for expected credit losses:
Balance at Beginning of Period	$ 5,581	$ 4,472	$ 4,472
Charged to Expenses	217	$ 342	2,229
Deductions Note	50		1,120
Balance at End of Period	$ 5,748		$ 5,581