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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