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FRESH-START ACCOUNTING - Adjustments Made To Successor Company Stock and Additional Paid-in Capital (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 08, 2019 | Oct. 02, 2019 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Oct. 01, 2019 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) | Feb. 09, 2018 $ / shares | Dec. 31, 2017 USD ($) | Sep. 09, 2016 $ / shares
Fresh-Start Adjustment |  |  |  |  |  |  |  |  |  |
Par value of 16,203,940 shares of new common stock issued to holders of senior note claims and existing equity interest claims (valued at $19.74per share) | $ |  | $ 2 | $ 2 | $ 16 | $ 2 |  |  |  |  |
Fair Value of warrants issued to holder of the Existing Equity Interests | $ |  | 7,336 |  | 7,336 |  |  |  |  |  |
Additional paid-in-capital (Successor) | $ |  | 322,294 |  |  |  |  |  |  |  |
Equity issuance costs | $ |  | (2,503) | (19) | (2,503) | (14) | $ (3,044) |  |  |  |
Total stockholders' equity | $ |  | $ 327,129 | $ 316,650 | $ 148,431 | $ 89,958 | $ 1,197,044 | $ 30,477 |  | $ 1,071,998 |
Common stock, shares issued | shares |  | 16,203,940 | 16,203,940 |  | 16,203,979 |  |  |  |  |
Share Price | $ / shares |  | $ 19.74 |  |  |  |  |  | $ 6.90 |  |
Annualized Rate Of Increase To The Strike Price Of Warrants Issued | 6.75 | 6.75 |  |  |  |  |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 14.04
Measurement Input Implied Strike Price |  |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  | 19.74 |  |  |  |  |  |  |  |
Measurement Input, Initial Strike Price | Series A Warrants |  |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment |  |  |  |  |  |  |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares |  | $ 40.17 |  |  |  |  |  |  |  |
Measurement Input, Initial Strike Price | Series B Warrants |  |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment |  |  |  |  |  |  |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares |  | 48.28 |  |  |  |  |  |  |  |
Measurement Input, Initial Strike Price | SeriesC Warrants [Member] |  |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment |  |  |  |  |  |  |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares |  | $ 60.45 |  |  |  |  |  |  |  |
Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  | 45 |  |  |  |  |  |  |  |

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