Related Party Transactions (Details)	6 Months Ended
Jun. 30, 2019
Avista and Crestview, majority unit holders of the Parent of the reporting unit
Related Party Transactions
Percentage of common shares outstanding held by related party	68.00%

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.

No definition available.

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