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Liquidity and Ability to Continue as a Going Concern (Details) - USD ($) $ in Thousands				3 Months Ended	6 Months Ended
	Sep. 03, 2020	May 22, 2020	May 15, 2020	Jun. 30, 2020	Jun. 30, 2020	May 26, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Petition date		May 22, 2020
Bankruptcy Proceedings, Court Where Petition Was Filed		United States Bankruptcy Court for the Southern District of Texas, Houston Division
Cash and cash equivalents				$ 36,994	$ 36,994		$ 571	$ 669	$ 6,452
DIP credit agreement with an average interest rate of 7.5% at June 30, 2020				8,000	$ 8,000		$ 0
Management's plans to alleviate the substantial doubt about going concern					In addition to reorganizing our capital structure in the Chapter 11 Cases, we have taken several actions to alleviate the conditions that cause substantial doubt about our ability to continue as a going concern, including (i) minimizing capital expenditures, (ii) aggressively managing working capital, (iii) further reducing recurring operating expenses, and (iv) exploring potential business transactions.
Payments for Postemployment Benefits				15,400
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations				5,400	$ 5,400
Debt Instrument, Periodic Payment, Interest			$ 21,500
Subsequent Event [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	1,800,000
Common Stock [Member] \| Subsequent Event [Member]
Percentage of New Common Shares of the Reorganized Company	12.50%
6.625% Senior Subordinated Notes Due 2021 [Member]
Percentage of Holders of Debtors Agreed under Restructuring Support Agreement		70.00%
Debt instrument maturity date					May 15, 2021
Unit Credit Agreement [Member]
Percentage of Lenders Agreed Under Restructuring Support Agreement		100.00%
Unit credit agreement				124,000	$ 124,000
DIP credit facility [Member]
Debtor-in-Possession Financing, Amount Arranged		$ 36,000				$ 18,000
DIP credit facility [Member] \| Subsequent Event [Member]
Percentage of Equity Allocated to Holders of Debtors	5.00%
Exit Credit Agreement [Member] \| Subsequent Event [Member]
Current Ratio Of Credit Facility	0.50
Interest Coverage Ratio	2.50
Letters of Credit Outstanding, Amount	$ 6,700
Exit Credit Agreement [Member] \| September 1, 2020 to March 31, 2021 [Member] \| Subsequent Event [Member]
Net leverage ratio	4.00
Exit Credit Agreement [Member] \| April 1, 2021 to June 30, 2022 [Member] \| Subsequent Event [Member]
Net leverage ratio	3.75
Exit Credit Agreement [Member] \| July 1, 2022 to September 30, 2022 [Member] \| Subsequent Event [Member]
Net leverage ratio	3.50
Exit Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Eurodollar [Member] \| Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate	5.25%
Exit Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Alternate Base Rate [Member] \| Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate	4.25%
Exit Credit Agreement [Member] \| Secured Debt [Member] \| Subsequent Event [Member]
Credit facility maximum credit amount	$ 40,000
Line of credit facility, amount outstanding	$ 92,000
Exit Credit Agreement [Member] \| Secured Debt [Member] \| Eurodollar [Member] \| Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate	6.25%
Exit Credit Agreement [Member] \| Secured Debt [Member] \| Alternate Base Rate [Member] \| Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate	5.25%
Exit Credit Agreement [Member] \| Secured Debt [Member] \| Revolving Credit Facility [Member] \| Subsequent Event [Member]
Credit facility maximum credit amount	$ 140,000
Debt instrument maturity date	Mar. 01, 2024
Line of credit facility, amount outstanding	$ 40,000
Minimum [Member]
Reorganization Value				270,000	270,000
Maximum [Member]
Reorganization Value				380,000	380,000
Median [Member]
Reorganization Value				$ 325,000	$ 325,000