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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Additional Paid-In Capital
Retained Earnings (Accumulated Deficit)
Total
Balances at Dec. 31, 2019 $ 2 $ 327,108 $ (10,460) $ 316,650
Balances (in shares) at Dec. 31, 2019 16,204      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     114,491 114,491
Equity issuance costs and other   (13)   (13)
Stock-based compensation   449   449
Balances at Mar. 31, 2020 $ 2 327,544 104,031 431,577
Balances (in shares) at Mar. 31, 2020 16,204      
Balances at Dec. 31, 2019 $ 2 327,108 (10,460) 316,650
Balances (in shares) at Dec. 31, 2019 16,204      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)       (165,950)
Balances at Sep. 30, 2020 $ 2 329,198 (176,410) 152,790
Balances (in shares) at Sep. 30, 2020 16,204      
Balances at Mar. 31, 2020 $ 2 327,544 104,031 431,577
Balances (in shares) at Mar. 31, 2020 16,204      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     (127,316) (127,316)
Stock-based compensation   910   910
Balances at Jun. 30, 2020 $ 2 328,454 (23,285) 305,171
Balances (in shares) at Jun. 30, 2020 16,204      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     (153,125) (153,125)
Stock-based compensation   744   744
Balances at Sep. 30, 2020 $ 2 329,198 (176,410) 152,790
Balances (in shares) at Sep. 30, 2020 16,204      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     (63,757) (63,757)
Stock-based compensation   925   925
Balances at Dec. 31, 2020 $ 2 330,123 (240,167) 89,958
Balances (in shares) at Dec. 31, 2020 16,204      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     (33,375) (33,375)
Long-term incentive plan vestings (in shares) 87      
Reduction in shares to cover individuals' tax withholding   (264)   (264)
Reduction in shares to cover individuals' tax withholding (in shares) (24)      
Stock-based compensation   692   692
Balances at Mar. 31, 2021 $ 2 330,551 (273,542) 57,011
Balances (in shares) at Mar. 31, 2021 16,267      
Balances at Dec. 31, 2020 $ 2 330,123 (240,167) 89,958
Balances (in shares) at Dec. 31, 2020 16,204      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)       (54,252)
Balances at Sep. 30, 2021 $ 2 331,660 (294,419) 37,243
Balances (in shares) at Sep. 30, 2021 16,274      
Balances at Mar. 31, 2021 $ 2 330,551 (273,542) 57,011
Balances (in shares) at Mar. 31, 2021 16,267      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     (33,929) (33,929)
Long-term incentive plan vestings (in shares) 1      
Reduction in shares to cover individuals' tax withholding   (5)   (5)
Stock-based compensation   571   571
Balances at Jun. 30, 2021 $ 2 331,117 (307,471) 23,648
Balances (in shares) at Jun. 30, 2021 16,268      
Increase (Decrease) in Stockholders' Equity        
Net income (loss)     13,052 13,052
Long-term incentive plan vestings (in shares) 8      
Reduction in shares to cover individuals' tax withholding   (22)   (22)
Reduction in shares to cover individuals' tax withholding (in shares) (2)      
Stock-based compensation   565   565
Balances at Sep. 30, 2021 $ 2 $ 331,660 $ (294,419) $ 37,243
Balances (in shares) at Sep. 30, 2021 16,274