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Exercise price per share or per unit of warrants or rights outstanding.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Amount of prepetition liabilities to be settled in cash.

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The percentage rate used to calculate dividend payments on preferred stock.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Number of new stock issued during the period.

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Chapter 11 Bankruptcy - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions			1 Months Ended		3 Months Ended	4 Months Ended	9 Months Ended	12 Months Ended
	Feb. 10, 2017	Oct. 01, 2016	Feb. 28, 2017	Feb. 09, 2017	Dec. 31, 2016	Feb. 09, 2017	Oct. 01, 2016	Dec. 31, 2017	Dec. 31, 2015
Predecessor \| Convertible Debt
Restructuring Cost and Reserve [Line Items]
Notes exchanged/converted							$ 232,100,000		$ 255,300,000
Predecessor \| 8.75% Senior Secured Notes due 2020 \| Secured Notes
Restructuring Cost and Reserve [Line Items]
Long-term debt, fixed interest rate		8.75%					8.75%
Predecessor \| 8.75% Senior Notes due 2020 \| Senior Notes
Restructuring Cost and Reserve [Line Items]
Long-term debt, fixed interest rate		8.75%					8.75%
Predecessor \| 7.5% Senior Notes due 2021 \| Senior Notes
Restructuring Cost and Reserve [Line Items]
Long-term debt, fixed interest rate		7.50%					7.50%
Predecessor \| 8.125% Senior Notes due 2022 \| Senior Notes
Restructuring Cost and Reserve [Line Items]
Long-term debt, fixed interest rate		8.125%					8.125%
Predecessor \| 8.125% Convertible Senior Notes due 2022
Restructuring Cost and Reserve [Line Items]
Long-term debt, fixed interest rate									8.125%
Predecessor \| 8.125% Convertible Senior Notes due 2022 \| Convertible Debt
Restructuring Cost and Reserve [Line Items]
Long-term debt, fixed interest rate		8.125%					8.125%
Predecessor \| 7.5% Convertible Senior Notes due 2023
Restructuring Cost and Reserve [Line Items]
Long-term debt, fixed interest rate									7.50%
Predecessor \| 7.5% Convertible Senior Notes due 2023 \| Convertible Debt
Restructuring Cost and Reserve [Line Items]
Long-term debt, fixed interest rate		7.50%					7.50%
Predecessor \| 7.5% Senior Notes due 2023 \| Senior Notes
Restructuring Cost and Reserve [Line Items]
Long-term debt, fixed interest rate		7.50%					7.50%
Predecessor \| 7.0% Convertible perpetual preferred stock
Restructuring Cost and Reserve [Line Items]
Preferred stock, dividend rate, percentage		7.00%							7.00%
Predecessor \| 8.5% Convertible perpetual preferred stock
Restructuring Cost and Reserve [Line Items]
Preferred stock, dividend rate, percentage		8.50%							8.50%
Predecessor \| Plan of Reorganization \| Holders of Senior Credit Facility \| Revolving Credit Facility
Restructuring Cost and Reserve [Line Items]
Cash payments for prepetition obligations		$ 35,000,000.0					$ 35,000,000.0
Predecessor \| Plan of Reorganization \| Holders of Senior Secured Notes \| Convertible Debt
Restructuring Cost and Reserve [Line Items]
Face amount of debt instrument		$ 281,800,000					$ 281,800,000
Annual interest rate		0.00%					0.00%
Predecessor \| Plan of Reorganization \| Holders of Unsecured Claims
Restructuring Cost and Reserve [Line Items]
Cash payments for prepetition obligations		$ 36,700,000					$ 36,700,000
Predecessor \| Plan of Reorganization \| Series A Warrants \| Holders of Unsecured Claims
Restructuring Cost and Reserve [Line Items]
Number of shares to be issued		4.9					4.9
Shares issued		4.5
Exercise price of warrants (in usd per share)		$ 41.34					$ 41.34
Predecessor \| Plan of Reorganization \| Series B Warrants \| Holders of Unsecured Claims
Restructuring Cost and Reserve [Line Items]
Number of shares to be issued		2.1					2.1
Shares issued		1.9
Exercise price of warrants (in usd per share)		$ 42.03					$ 42.03
Predecessor \| Plan of Reorganization \| New First Lien Exit Facility
Restructuring Cost and Reserve [Line Items]
Cash collateral		$ 50,000,000.0					$ 50,000,000.0
Predecessor \| Plan of Reorganization \| 8.75% Senior Secured Notes due 2020 \| Holders of Senior Secured Notes \| Secured Notes
Restructuring Cost and Reserve [Line Items]
Notes exchanged/converted		78,000,000.0
Predecessor \| Plan of Reorganization \| Building Note \| Secured Notes
Restructuring Cost and Reserve [Line Items]
Face amount of debt instrument		35,000,000.0					35,000,000.0
Fair value of debt		36,600,000					$ 36,600,000
Proceeds from issuance of debt		$ 26,800,000
Predecessor \| Plan of Reorganization \| New Common Stock
Restructuring Cost and Reserve [Line Items]
Common stock, shares authorized		18.9					18.9
Predecessor \| Plan of Reorganization \| New Common Stock \| Holders of Senior Secured Notes
Restructuring Cost and Reserve [Line Items]
Shares issued		13.7
Predecessor \| Plan of Reorganization \| New Common Stock \| Holders of Unsecured Claims
Restructuring Cost and Reserve [Line Items]
Number of shares to be issued		5.7					5.7
Shares issued		5.2
Predecessor \| Plan of Reorganization \| 7.0% Convertible perpetual preferred stock
Restructuring Cost and Reserve [Line Items]
Preferred stock, dividend rate, percentage		7.00%
Predecessor \| Plan of Reorganization \| 8.5% Convertible perpetual preferred stock
Restructuring Cost and Reserve [Line Items]
Preferred stock, dividend rate, percentage		8.50%
Successor
Restructuring Cost and Reserve [Line Items]
Face value of long-term debt					$ 305,308,000			$ 37,502,000
Successor \| Series A Warrants
Restructuring Cost and Reserve [Line Items]
Number of shares to be issued		4.9					4.9
Shares issued		4.5						0.1
Exercise price of warrants (in usd per share)		$ 41.34					$ 41.34
Successor \| Series B Warrants
Restructuring Cost and Reserve [Line Items]
Number of shares to be issued		2.1					2.1
Shares issued		1.9
Exercise price of warrants (in usd per share)		$ 42.03					$ 42.03
Successor \| Amended New Credit Facility \| Revolving Credit Facility
Restructuring Cost and Reserve [Line Items]
Line of credit facility, current borrowing capacity	$ 425,000,000.0
Maximum borrowing capacity	600,000,000.0
Face value of long-term debt								$ 0
Successor \| New First Lien Exit Facility \| Revolving Credit Facility
Restructuring Cost and Reserve [Line Items]
Maximum borrowing capacity		$ 425,000,000.0					$ 425,000,000.0
Face value of long-term debt					$ 0			0
Successor \| Convertible Notes \| Convertible Debt
Restructuring Cost and Reserve [Line Items]
Notes exchanged/converted	$ 263,700,000
Face amount of debt instrument		281,800,000					281,800,000
Fair value of debt		$ 445,700,000					$ 445,700,000
Annual interest rate		0.00%					0.00%
Common stock issued for debt (in shares)	14.1	15.0	14.1	0.3	0.7	1.0
Face value of long-term debt					$ 268,780,000			0
Successor \| Building Note \| Secured Notes
Restructuring Cost and Reserve [Line Items]
Face amount of debt instrument		$ 35,000,000.0					$ 35,000,000.0
Fair value of debt		36,600,000					$ 36,600,000
Proceeds from issuance of debt		$ 26,800,000
Face value of long-term debt					$ 36,528,000			$ 37,502,000
Successor \| New Common Stock
Restructuring Cost and Reserve [Line Items]
Shares issued								0.1