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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Expected expiration period of unrecognized tax benefits	12 months
Successor
Operating Loss Carryforwards [Line Items]
Release of AMT valuation allowance	$ (8,700)
Valuation allowance	500,949	$ 1,119,721
Income tax expense due to TCJA	243,800
Net deferred tax asset	0	$ 0
Successor | Alternative Minimum Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Alternative minimum tax credits, not subject to expiration	$ 4,700
Successor | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards expiration year	2025
Successor | Latest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards expiration year	2037
Successor | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Federal net operating loss carryovers	$ 805,300
Predecessor
Operating Loss Carryforwards [Line Items]
Valuation allowance			$ 2,000,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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