BASIS OF FINANCIAL STATEMENT PRESENTATION - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Non-cash capital expenditures	$ 1,600,000	$ 2,300,000
Proportion of trade receivables in cash at time of sale (as a percent)	90.00%
Proportion of trade receivables in cash when customer pays (as a percent)	10.00%
Maximum amount subject to Receivables Purchases Agreements for a certain customer	$ 10,000,000.0
Maximum amount subject to Receivables Purchases Agreements in aggregate	50,000,000.0
Trade Accounts Receivable
Debt Instrument [Line Items]
Disposal of assets	34,100,000	32,700,000
Proceeds from sale of trade receivables	31,200,000	30,200,000
Fees related to disposal of trade receivables	$ 100,000	$ 100,000