Chapter 11 Filing (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 11, 2018
Cash payment for reorganization items	$ 0	$ 70	$ 0	$ 90
Subject To Review By Bankruptcy Court [Member]
Disallowed bankruptcy claims, amount					$ 500

Amount of bankruptcy claim filed with bankruptcy court that are likely to be denied.

No definition available.

Name:	us-gaap_BankruptcyClaimsAmountOfFiledClaimsLikelyToBeDenied
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant