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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 2,313,223,000	$ 2,313,223,000		$ 2,145,935,000	$ 3,325,622,000
Total amortization expense related to definite-lived intangible assets		66,300,000	$ 64,300,000
Impairment of intangibles			0
Goodwill impairment		0	1,200,000,000	$ 1,224,374,000
Triton Digital
Indefinite-lived Intangible Assets [Line Items]
Consideration transferred for acquisition	228,400,000
Assets acquired	69,700,000	69,700,000
Intangible assets acquired	190,700,000	190,700,000
Goodwill	167,400,000	167,400,000
Tax-deductible goodwill	6,900,000	6,900,000
Liabilities assumed	$ 32,000,000.0	$ 32,000,000.0
FCC Licenses
Indefinite-lived Intangible Assets [Line Items]
Impairment of FCC licenses			$ 502,700,000

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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