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Related Party Transactions (Details) - USD ($)					12 Months Ended
Related Party Transactions (Details) - USD ($)	Sep. 21, 2016	Sep. 07, 2016	Jun. 17, 2016	Jun. 13, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2014
Related party transactions
Initial term of lease					20 years
Non-cash distribution declared							$ 38,838,000
Cash distribution to members	$ 100,000,000				$ 101,755,000	$ 149,633,000	236,145,000
AutoMatch Distribution
Related party transactions
Non-cash distribution declared				$ 38,800,000
Cash distribution to members		$ 200,000	$ 3,600,000
Membership units
Distribution declared				42,700,000
Cash distribution declared				$ 3,800,000
Stephen Adams
Related party transactions
Payments to related party for purchasing advertising services					200,000	0
FreedomRoads \| AutoMatch Distribution
Related party transactions
Cash distribution to members		1,600,000
Membership units
Cash distribution declared		$ 1,600,000
JD Custom
Related party transactions
Related party expense					400,000	0
Monitoring Agreement \| Crestview Advisors, L.L.C. and Stephen Adams
Related party transactions
Related party expense							1,700,000
Monitoring Agreement \| Crestview Advisors, L.L.C
Related party transactions
Annual monitoring fee							1,000,000
Quarterly installments							250,000
Monitoring Agreement \| Stephen Adams
Related party transactions
Annual monitoring fee							1,000,000
Quarterly installments							250,000
Reimbursable Fees \| Crestview Advisors, L.L.C. and Stephen Adams
Related party transactions
Related party expense							200,000
Reimbursable Fees \| Crestview Advisors, L.L.C
Related party transactions
Managers' reimbursable expenses per annum per related party							250,000
Reimbursable Fees \| Stephen Adams
Related party transactions
Managers' reimbursable expenses per annum per related party							250,000
Related Party Agreement \| eNET IT Group
Related party transactions
Related party expense							100,000
Related Party Agreement \| Andris A. Baltins
Related party transactions
Related party expense					300,000	300,000
Related Party Agreement \| Precise Graphix
Related party transactions
Related party expense					5,600,000	2,700,000	3,300,000
Put Agreement \| Mr. Lemonis
Related party transactions
Number of profits units								4,667
Pledged profit units								$ 12,000,000
Advertising Agreement \| Cumulus Media
Related party transactions
Related party expense					300,000	400,000	0
FreedomRoads \| Lease Agreement \| Managers and Officers
Related party transactions
Related party expense					$ 1,900,000	$ 2,000,000	$ 1,200,000
FreedomRoads \| Lease Agreement \| Mr. Lemonis \| Original Lease
Related party transactions
Initial term of lease					132 months
Base rent					$ 29,000
FreedomRoads \| Lease Agreement \| Mr. Lemonis \| Expansion Lease
Related party transactions
Initial term of lease					132 months
Base rent					$ 2,500
Mr. Lemonis \| eNET IT Group
Related party transactions
Economic interest (as a percent)							51.00%
Mr. Lemonis \| Precise Graphix
Related party transactions
Economic interest (as a percent)					33.00%
Mr. Lemonis \| JD Custom
Related party transactions
Indirect interest					52.00%
Stephen Adams \| Adams Radio \| Stephen Adams
Related party transactions
Indirect interest					0.90%
AutoMatch \| Transition Services Agreement \| FreedomRoads
Related party transactions
Agreement period				120 days