Nature of Business, Interim Financial Data and Basis of Presentation (Condensed Supplemental Cash Flow) (Details) - USD ($)	1 Months Ended	2 Months Ended	3 Months Ended	5 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 03, 2018	Jun. 30, 2017	Jun. 03, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 04, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental disclosures of non-cash flow information:
Trade revenue	$ 3,300,000	$ 0	$ 8,900,000		$ 19,000,000	$ 20,300,000
Predecessor Company
Supplemental disclosures of cash flow information:
Interest paid				$ 0		62,609,000
Income taxes paid				1,992		2,790,000
Supplemental disclosures of non-cash flow information:
Trade revenue				18,973,000		20,253,000
Trade expense				17,964,000		19,485,000
Transfer of deposit from escrow - WKQX acquisition				0		0
Supplemental disclosures of non-cash reorganization items:
Accounts receivable				(11,000)
Prepaid expenses and other current assets				21,077,000		0
Property and equipment				(121,732,000)		0
Other intangible assets, goodwill and other assets				283,217,000		0
Accounts payable, accrued expenses and other liabilities				(36,415,000)		0
Long-term debt				(994,407,000)
Stockholders' equity				324,620,000		0
Reconciliation of cash and cash equivalents and restricted cash to the Condensed Consolidated Balance Sheet:
Cash and cash equivalents		50,046,000	141,195,000	50,046,000		141,195,000		$ 102,891,000
Restricted cash		38,305,000	7,822,000	38,305,000		7,822,000
Total cash and cash equivalents and restricted cash		$ 88,351,000	$ 149,017,000	$ 88,351,000		$ 149,017,000		$ 111,890,000	$ 139,284,000
Successor Company
Supplemental disclosures of cash flow information:
Interest paid	5,878,000
Income taxes paid	2,847,000
Supplemental disclosures of non-cash flow information:
Trade revenue	3,297,000
Trade expense	3,246,000
Transfer of deposit from escrow - WKQX acquisition	4,750,000
Supplemental disclosures of non-cash reorganization items:
Prepaid expenses and other current assets	0
Property and equipment	0
Other intangible assets, goodwill and other assets	0
Accounts payable, accrued expenses and other liabilities	0
Stockholders' equity	0
Reconciliation of cash and cash equivalents and restricted cash to the Condensed Consolidated Balance Sheet:
Cash and cash equivalents	37,444,000				37,444,000
Restricted cash	29,226,000				29,226,000
Total cash and cash equivalents and restricted cash	$ 66,670,000				$ 66,670,000		$ 88,351,000