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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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