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Earnings Per Share - Narrative (Details) - shares		3 Months Ended
	Jan. 27, 2017	Mar. 31, 2019	Mar. 31, 2018	Feb. 28, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock reserved to settle claims of unsecured creditors (in shares)		7,080,000
Common stock contemplated by the Plan (in shares)	40,000,000	40,000,000
Shares issued to settle claims (in shares)				2,770,000
Incremental common shares attributable to dilutive effect of preferred stock (in shares)		0
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)		0	225,000
Performance-based Restricted Stock Units (PRSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)		0	0

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Bankruptcy Claims, Shares Issued to Creditors

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Common Stock, Total Shares Contemplated

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted method.

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-Publisher FASB
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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

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