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Equity - Use of IPO Proceeds (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 26, 2018 | Jul. 17, 2018 | Feb. 28, 2018 | Feb. 28, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Net proceeds from IPO |  |  |  | $ 0 | $ 0 | $ 0 | $ 133,805
Series A Preferred Stock Conversion and Common Stock Offering |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Net proceeds from IPO | $ 110,000 |  |  |  |  |  |
Net proceeds received | $ 60,000 |  |  |  |  |  |
Issuance of shares of common stock in the IPO (in shares) | 8,695,653 | 8,695,653 |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 14.00 |  |  |  |  |  |
Additional shares sold directly by the selling shareholders |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Number of shares sold (in shares) |  | 2,545,630 |  |  |  |  |
Sale of stock, price per share (in dollars per share) |  | $ 14.00 |  |  |  |  |
RBL Facility |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Payment to the holders of claims under the Pre-Emergence Credit Facility |  |  |  | $ 0 | $ 23,285 | $ 353,282 | $ 582,510
Line of credit | RBL Facility |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Payment to the holders of claims under the Pre-Emergence Credit Facility | $ 105,000 |  | $ 379,000 |  |  |  |
Oaktree Capital Management and Benefit Street Partners Stock Purchase Agreements | Oaktree Capital Management And Benefit Street Partners |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Number of shares purchased (in shares) |  | 1,802,196 |  |  |  |  |
Net proceeds from the IPO to purchase shares of common stock from certain stockholders |  | $ 24,000 |  |  |  |  |
Oaktree Capital Management and Benefit Street Partners Stock Purchase Agreements | Oaktree Capital Management |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Number of shares purchased (in shares) |  | 410,229 |  |  |  |  |
Oaktree Capital Management and Benefit Street Partners Stock Purchase Agreements | Benefit Street Partners |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Number of shares purchased (in shares) |  | 1,391,967 |  |  |  |  |

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