Nature of Business, Interim Financial Data and Basis of Presentation (Condensed Supplemental Cash Flow) (Details) - USD ($) $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended	5 Months Ended	6 Months Ended
	Jun. 04, 2018	Jun. 30, 2018	Jun. 03, 2018	Jun. 30, 2019	Jun. 03, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Supplemental disclosures of non-cash flow information:
Trade revenue		$ 3,300	$ 7,700	$ 10,700	$ 19,000	$ 24,000
Reconciliation of cash and cash equivalents and restricted cash to the Condensed Consolidated Balance Sheet:
Restricted cash				2,500		2,500		$ 2,500
Successor Company
Supplemental disclosures of cash flow information:
Interest paid		5,878				41,978
Income taxes paid		2,847				14,134
Supplemental disclosures of non-cash flow information:
Trade revenue		3,297				23,980
Trade expense		3,246				22,008
Transfer of deposit from escrow - WKQX acquisition		4,750				0
Accounts receivable		0				0
Prepaid expenses and other current assets		0				0
Property and equipment		0				0
Other intangible assets, goodwill and other assets		0				0
Accounts payable, accrued expenses and other liabilities		0				0
Reconciliation of cash and cash equivalents and restricted cash to the Condensed Consolidated Balance Sheet:
Cash and cash equivalents		37,444		20,500		20,500	$ 37,444	27,584
Restricted cash		29,226		2,466		2,466	29,226	2,454
Total cash and cash equivalents and restricted cash	$ 88,351	$ 66,670		$ 22,966		$ 22,966	66,670	$ 30,038
Predecessor Company
Supplemental disclosures of cash flow information:
Interest paid							0
Income taxes paid							1,992
Supplemental disclosures of non-cash flow information:
Trade revenue							18,973
Trade expense							17,964
Transfer of deposit from escrow - WKQX acquisition							0
Accounts receivable							(11)
Prepaid expenses and other current assets							21,077
Property and equipment							(121,732)
Other intangible assets, goodwill and other assets							283,217
Accounts payable, accrued expenses and other liabilities							(36,415)
Issuance of Successor Company Term Loan							1,300,000
Cancellation of Predecessor Company stockholders' equity	$ (1,397,917)						649,620
Issuance of Successor Company stockholders' equity							(325,000)
Reconciliation of cash and cash equivalents and restricted cash to the Condensed Consolidated Balance Sheet:
Cash and cash equivalents			50,046		50,046
Restricted cash			38,305		38,305
Total cash and cash equivalents and restricted cash			$ 88,351		$ 88,351				$ 111,890
Senior Notes at 7.75% | Predecessor Company
Supplemental disclosures of non-cash flow information:
Noncash cancellation of debt							(610,000)
Term Loan | Predecessor Company
Supplemental disclosures of non-cash flow information:
Noncash cancellation of debt							$ (1,684,407)