REVENUE RECOGNITION - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Rebates	$ (202,667,000)	$ (198,547,000)	$ (574,344,000)	$ (549,670,000)
Revenue recognized fro performance obligation satisfied in previous period	0	0	0	0
Gross receivables from contracts	74,086,000		74,086,000		$ 80,191,000
Contract liabilities	2,754,000		2,754,000		$ 2,299,000
Adjustments | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Rebates	$ 1,018,000	$ 1,027,000	$ 3,555,000	$ 3,474,000