Emergence from Chapter 11 and Fresh Start Accounting - Cumulative Impact of Fresh-start Adjustments (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Eliminate historical loss from Predecessor
Fresh-Start Adjustment [Line Items]
Retained earnings impact	$ (678,485)
Eliminate retained deficit due to Prepackaged Plan Effects upon emergence
Fresh-Start Adjustment [Line Items]
Retained earnings impact	518,767
Fresh Start Adjustments
Fresh-Start Adjustment [Line Items]
Retained earnings impact	$ (159,718)

Amount of fresh-start adjustment to retained earnings or deficit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56426-112766

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=64805424&loc=d3e55811-112764

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