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FRESH-START ACCOUNTING-Cancellation of predecessor equity (Details) - USD ($) $ in Thousands		8 Months Ended
	Sep. 09, 2016	Sep. 09, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cancellation of predecessor equity
Company Stock	$ (571,123)	$ (571,123)	$ (1,197,044)	$ (1,071,998)	$ (112,688)
Fair value of equity issued to Predecessor common stockholders	554,432	554,432
Predecessor
Cancellation of predecessor equity
Company Stock	933,139	933,139				$ (52,414)
Fair value of equity issued to Predecessor common stockholders	(22,176)	(22,176)
Cash payment to Preferred Holders		(11,100)
Reorganization Adjustments
Cancellation of predecessor equity
Company Stock	(1,896,494)	(1,896,494)
Reorganization Adjustments | Predecessor
Cancellation of predecessor equity
Company Stock	(3,287,918)	(3,287,918)
Fair value of equity issued to Predecessor common stockholders	(22,176)	$ (22,176)
Cash payment to Preferred Holders	(11,100)
Cancellation of Predecessor Company equity	$ 3,254,642

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Represents the cancellation of equity.

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Amount cash outflow for payments to preferred stockholders.

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- Definition

Fair value of the entity's equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(31))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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