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BASIS OF PRESENTATION - Narrative (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 16, 2020 | Mar. 26, 2020 | Mar. 13, 2020 | Jul. 31, 2020 | Mar. 31, 2020 | May 01, 2019 | Sep. 30, 2020 | Dec. 31, 2018 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | May 02, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | $ 713,728,000 |  |  |  | $ 400,300,000 |  |  |
Goodwill impairment |  |  |  |  | $ 1,200,000,000 |  | $ 1,224,374,000 |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  |  | $ 2,779,115,000 | $ 1,039,648,000 | $ (11,560,342,000) | $ 1,065,642,000 |  | 2,945,441,000 | $ 2,846,917,000 | $ 2,820,048,000 | $ 2,779,115,000
Credit loss reserve for available-for-sale debt securities |  |  |  |  |  |  | 5,600,000 |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  |  |  |  | 128,908,000 |  |  |  |  |  |
Asset-based Revolving Credit Facility due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of facilities |  |  |  | $ 235,000,000.0 |  |  |  |  |  |  |  |  |  |
Subsidiary | Asset-based Revolving Credit Facility due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of facilities | $ 235,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | 2,500,000,000 |  |  |  |  |  |  |  |  |  |
Line of Credit | Asset-based Revolving Credit Facility due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | 450,000,000.0 |  |  |  |  |  |  |
Maximum borrowings provided under credit facility |  |  |  |  |  |  | 365,600,000 |  |  |  |  |  |  |
Outstanding borrowings under facility |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  | 41,200,000 |  |  |  |  |  |  |
Line of credit, excess availability |  |  |  |  |  |  | 324,400,000 |  |  |  |  |  |  |
Line of credit, amount available to be drawn |  |  |  |  |  |  | 165,000,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of term loan |  |  |  | $ 450,000,000.0 |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  |  | $ 0 | $ (1,807,086,000) | (13,345,346,000) | $ (1,774,974,000) |  | $ 112,548,000 | $ 51,167,000 | $ 38,793,000 | $ 0
Retained Earnings (Accumulated Deficit) | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  |  |  |  | $ 128,908,000 |  | $ 1,500,000 |  |  |  |

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