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BASIS OF PRESENTATION - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 16, 2020
Mar. 26, 2020
Mar. 13, 2020
Jul. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2018
Jan. 01, 2020
Dec. 31, 2019
May 02, 2019
May 01, 2019
Mar. 31, 2019
Segment Reporting Information [Line Items]                            
Cash and cash equivalents         $ 517,684,000   $ 517,684,000       $ 400,300,000      
Long-term debt         5,837,122,000   5,837,122,000       5,765,416,000      
Goodwill impairment           $ 1,200,000,000 1,224,374,000              
Accounting Standards Update [Extensible List]           us-gaap:AccountingStandardsUpdate201613Member     us-gaap:AccountingStandardsUpdate201602Member          
Cumulative effect adjustment         1,065,642,000 $ 1,259,302,000 1,065,642,000 $ 2,820,048,000 $ (11,560,342,000)   2,945,441,000 $ 2,779,115,000 $ 2,779,115,000 $ (11,566,113,000)
Credit loss reserve for available-for-sale debt securities         5,600,000   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         115,000,000.0                  
Asset-based Revolving Credit Facility due 2023 | Subsequent Event                            
Segment Reporting Information [Line Items]                            
Repayments of facilities       $ 235,000,000.0                    
Term Loan | Subsequent Event                            
Segment Reporting Information [Line Items]                            
Proceeds from issuance of term loan       450,000,000.0                    
Subsidiary | Asset-based Revolving Credit Facility due 2023 | Subsequent Event                            
Segment Reporting Information [Line Items]                            
Repayments of facilities $ 235,000,000.0                          
Subsidiary | Term Loan | Subsequent Event                            
Segment Reporting Information [Line Items]                            
Debt instrument, face amount 450,000,000.0     2,500,000,000                    
Proceeds from issuance of term loan $ 425,800,000                          
Line of Credit | Asset-based Revolving Credit Facility due 2023                            
Segment Reporting Information [Line Items]                            
Debt instrument, face amount         450,000,000.0   450,000,000.0              
Maximum borrowings provided under credit facility         289,400,000   289,400,000              
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                            
Segment Reporting Information [Line Items]                            
Long-term debt         4,399,397,000   4,399,397,000       4,322,263,000      
Secured Debt | Asset-based Revolving Credit Facility due 2023                            
Segment Reporting Information [Line Items]                            
Long-term debt         235,000,000   235,000,000       0      
Secured Debt | Subsidiary | Subsequent Event                            
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         $ (1,774,974,000) $ (1,577,657,000) $ (1,774,974,000) $ 38,793,000 (13,345,346,000)   $ 112,548,000 $ 0 $ 0 $ (13,330,821,000)
Retained Earnings (Accumulated Deficit) | Cumulative Effect, Period of Adoption, Adjustment                            
Segment Reporting Information [Line Items]                            
Cumulative effect adjustment                 $ 128,908,000 $ 1,500,000