BASIS OF FINANCIAL STATEMENT PRESENTATION - Transfers of Financial Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounting Policies [Abstract]
Total trade accounts receivable balances sold	$ 30,961	$ 10,288	$ 65,107	$ 42,974
Total cash received	29,268	9,374	60,507	39,533
Total fees incurred	$ 173	$ 76	$ 308	$ 142