The amount of trade accounts payable included in liabilities subject to compromise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56015-112765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=114872137&loc=d3e55717-112764

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766

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

Emergence from Voluntary Reorganization under Chapter 11 - Liabilities Subject to Compromise (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Feb. 28, 2017	Dec. 31, 2016
Reorganization Items [Line Items]
Liabilities subject to compromise	$ 100	$ 35,000	$ 1,000,336
Predecessor
Reorganization Items [Line Items]
Accounts payable and accrued expenses				$ 151,515
Accrued interest payable				15,238
Debt				833,800
Liabilities subject to compromise				$ 1,000,553