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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2018 USD ($) | Mar. 31, 2019 USD ($) day | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Oct. 09, 2018 | Mar. 26, 2018 | Mar. 21, 2018 | Mar. 14, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Intercompany note, amount written down |  |  |  | $ 855,600 |  |  |  |  |
Post-petition balance of intercompany liability |  | $ 73,700 |  |  |  |  |  |  |
Royalties waived |  |  |  |  | $ 31,800 |  |  |  |
Intercompany note waived |  |  | $ 21,600 |  | 21,600 |  |  |  |
Additional amount of intercompany liability |  | 52,100 |  |  |  |  |  |  |
Intercompany note payable |  | 154,800 | 10,200 | 1,067,600 | 10,200 |  |  |  | $ 1,031,700
Total net payment of intercompany note |  | $ 107,000 |  |  |  |  |  |  |
Number of days before required repayment of intercompany liability | day |  | 15 |  |  |  |  |  |  |
Decrease in other long-term liabilities from error correction |  | $ (296,896) | (489,829) |  | $ (489,829) |  |  |  |
6.875% Senior Notes due 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 6.875% |  | 6.875% |
7.25% Senior Notes due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 7.25% |  | 7.25% |
14.0% Senior Notes Due 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 14.00% |  |  |  |  | 14.00% |  |
Ministry of Economic Affairs and Finance, Italy |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Estimated loss from Italy investigation |  | $ 17,000 |  |  |  |  |  |  |
Payment to tax authority |  |  | $ 8,600 |  |  |  |  |  |
VAT Obligation |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Decrease in other long-term liabilities from error correction |  |  |  | $ 16,900 |  |  |  |  |
CCOH Separation Settlement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Intercompany note payable |  | $ 149,000 |  |  |  |  |  |  |
CCOH Separation Settlement | Chapter 11 Cases |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss contingency, loss | $ 149,000 |  |  |  |  |  |  |  |
CCOH Separation Settlement | Unsecured Revolving Line of Credit Issued To Debtors |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss contingency, loss | $ 200,000 |  |  |  |  |  |  |  |

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