Long-Term Debt - Additional Information (Details) - USD ($)
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1 Months Ended |
3 Months Ended |
9 Months Ended |
12 Months Ended |
Sep. 07, 2016 |
May 31, 2015 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Dec. 31, 2017 |
| 9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020 |
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| Debt Instrument [Line Items] |
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| Debt instrument interest rate |
9.00%
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9.00%
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9.00%
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9.00%
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| Debt instrument maturity date |
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May 15, 2020
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May 15, 2020
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| Debt instrument paid in kind interest rate |
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10.75%
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10.75%
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10.75%
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| Debt instrument payment terms |
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Interest was payable on May 15 and November 15 of each year. For the interest period from November 15, 2017 up to and including March 6, 2018, we had the option to pay all or a portion of interest in-kind at the rate of 10.75% per annum, which if so exercised, is added to the principal amount.
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| Debt instrument stated interest rate percentage for payment-in-kind |
10.75%
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| Cash interest payable stub period |
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Mar. 06, 2018
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| 8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 |
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| Debt Instrument [Line Items] |
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| Debt instrument interest rate |
8.50%
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8.50%
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8.50%
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8.50%
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| Debt instrument maturity date |
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Jun. 15, 2021
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Jun. 15, 2021
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| Debt instrument paid in kind interest rate |
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10.00%
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10.00%
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10.00%
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| Debt instrument payment terms |
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For the interest periods up to and including September 6, 2018, if we so elected, we had the option to pay all or a portion of interest in-kind at a rate of 10.00% per annum. If so elected, such in-kind were added to the principal amount.
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| Debt instrument stated interest rate percentage for payment-in-kind |
10.00%
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| Cash interest payable stub period |
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Sep. 06, 2018
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| 11.00% 1.5 Lien Term Loan, Due November 2019 |
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| Debt Instrument [Line Items] |
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| Debt instrument interest rate |
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11.00%
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11.00%
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11.00%
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| Debt instrument maturity date |
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Nov. 15, 2019
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Nov. 15, 2019
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| Revolving Bank Credit Facility Due November 2018 |
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| Debt Instrument [Line Items] |
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| Revolving bank credit facility borrowing base |
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$ 150,000,000
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$ 150,000,000
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| First lien leverage ratio |
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200.00%
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| Outstanding balances on the revolving bank credit facility (including letters of credit) |
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5,000,000
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$ 5,000,000
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| Unused portion of the borrowing base commitment fee |
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0.50%
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| Credit agreement expiration date |
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Nov. 08, 2018
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| Revolving bank credit facility borrowings outstanding |
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0
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$ 0
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$ 0
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| Letters of credit outstanding |
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9,700,000
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9,700,000
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$ 300,000
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| Remaining availability |
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140,300,000
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140,300,000
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| Amount of cash deposit required for issuance of letters of credit |
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4,700,000
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4,700,000
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| Unrestricted cash balance exceeding threshold |
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35,000,000
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35,000,000
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| Revolving Bank Credit Facility Due November 2018 | Letters of Credit |
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| Debt Instrument [Line Items] |
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| Revolving bank credit facility maximum lender commitment |
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150,000,000
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150,000,000
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| Revolving Bank Credit Facility Due November 2018 | Scenario Covenants |
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| Debt Instrument [Line Items] |
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| Maximum unrestricted cash balance if revolver balance is above $5 million |
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$ 35,000,000
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$ 35,000,000
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| Revolving Bank Credit Facility Due November 2018 | Minimum |
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| Debt Instrument [Line Items] |
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| Credit agreement, current ratio |
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100.00%
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| Revolving Bank Credit Facility Due November 2018 | Minimum | Eurodollar |
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| Debt Instrument [Line Items] |
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| Debt instrument, basis spread on variable rate |
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3.00%
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| Revolving Bank Credit Facility Due November 2018 | Maximum | Eurodollar |
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| Debt Instrument [Line Items] |
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| Debt instrument, basis spread on variable rate |
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4.00%
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| 11.00% 1.5 Lien Term Loan, Due November 2019 |
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| Debt Instrument [Line Items] |
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| Debt instrument interest rate |
11.00%
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| Debt instrument maturity date |
Nov. 15, 2019
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| Debt instrument payment terms |
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Interest accrued at 11.00% per annum and is payable quarterly in cash.
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| Debt instrument frequency of interest payment in cash |
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quarterly
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| Debt instrument, maturity date, description |
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1.5 Lien Term Loan with a maturity date of November 15, 2019.
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| 9.00 % Second Lien Term Loan, Due May 2020 |
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| Debt Instrument [Line Items] |
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| Debt instrument interest rate |
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9.00%
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9.00%
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9.00%
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9.00%
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| Debt instrument maturity date |
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May 15, 2020
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May 15, 2020
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| Debt instrument payment terms |
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Interest on the Second Lien Term Loan was payable in arrears semi-annually on May 15 and November 15.
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| Debt instrument discount rate |
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1.00%
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| Annual effective interest rate |
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9.60%
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9.60%
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| 8.50% Unsecured Senior Notes, Due June 2019 |
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| Debt Instrument [Line Items] |
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| Debt instrument interest rate |
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8.50%
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8.50%
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8.50%
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| Debt instrument maturity date |
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Jun. 15, 2019
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Jun. 15, 2019
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| Debt instrument payment terms |
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semi-annually in arrears on June 15 and December 15
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| Annual effective interest rate |
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8.40%
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8.40%
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| 2016 Restructuring Transactions |
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| Debt Instrument [Line Items] |
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| Interest expense |
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$ 0
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$ 0
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$ 0
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$ 0
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| 2016 Restructuring Transactions | Scenario, Forecast |
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| Debt Instrument [Line Items] |
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| Interest expense |
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$ 0
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| 2016 Restructuring Transactions | 9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020 |
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| Debt Instrument [Line Items] |
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| Debt instrument maturity date |
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May 15, 2020
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| 2016 Restructuring Transactions | 9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020 | Minimum |
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| Debt Instrument [Line Items] |
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| Debt instrument interest rate |
9.00%
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| 2016 Restructuring Transactions | 9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020 | Maximum |
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| Debt Instrument [Line Items] |
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| Debt instrument paid in kind interest rate |
10.75%
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| 2016 Restructuring Transactions | 8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 |
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| Debt Instrument [Line Items] |
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| Debt instrument maturity date |
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Jun. 15, 2021
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| 2016 Restructuring Transactions | 8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 | Minimum |
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| Debt Instrument [Line Items] |
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| Debt instrument interest rate |
8.50%
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| 2016 Restructuring Transactions | 8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 | Maximum |
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| Debt Instrument [Line Items] |
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| Debt instrument paid in kind interest rate |
10.00%
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| 2016 Restructuring Transactions | 11.00% 1.5 Lien Term Loan, Due November 2019 |
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| Debt Instrument [Line Items] |
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| Debt instrument interest rate |
11.00%
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| Debt instrument maturity date |
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Nov. 15, 2019
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