Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Revenues (Trade and Barter Transactions) (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 03, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Successor
Revenue from External Customer [Line Items]
Trade revenue		$ 26,516
Predecessor
Revenue from External Customer [Line Items]
Trade revenue	$ 18,973		$ 40,080	$ 37,691