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BASIS OF PRESENTATION - Narrative (Details) - USD ($)			3 Months Ended
BASIS OF PRESENTATION - Narrative (Details) - USD ($)	Mar. 26, 2020	Mar. 13, 2020	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2020	Dec. 31, 2019	Jan. 01, 2019
Segment Reporting Information [Line Items]
Cash and cash equivalents			$ 646,774,000			$ 400,300,000
Goodwill impairment			1,224,374,000
Adoption of ASC 842, Leases							$ 128,908,000
Credit loss reserve for available-for-sale debt securities			5,600,000
Line of Credit \| Asset-based Revolving Credit Facility due 2023
Segment Reporting Information [Line Items]
Maximum borrowings provided under credit facility			450,000,000.0
Letters of credit outstanding			47,300,000
Line of credit, excess availability			52,700,000
Line of Credit \| Subsidiary \| Asset-based Revolving Credit Facility due 2023
Segment Reporting Information [Line Items]
Draws on credit facilities	$ 350,000,000.0	$ 350,000,000.0	350,000,000.0
FCC Licenses
Segment Reporting Information [Line Items]
Impairment of FCC licenses			$ 502,700,000	$ 91,400,000
Retained Earnings (Accumulated Deficit)
Segment Reporting Information [Line Items]
Adoption of ASC 842, Leases					$ 1,500,000		$ 128,908,000