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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock
Common Stock
Additional Paid-In Capital
Retained Earnings (Accumulated Deficit)
Total
Balances at Dec. 31, 2016   $ 9 $ 592,663 $ (479,984) $ 112,688
Balances (in shares) at Dec. 31, 2016   92,991      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       189,352 189,352
Sale of preferred stock     352,048   352,048
Sale of preferred stock (in shares) 6        
Preferred beneficial conversion feature     48,007   48,007
Offering costs     (11,829)   (11,829)
Long-term incentive plan forfeitures (in shares)   (41)      
Reduction in shares to cover individuals' tax withholding     (17)   (17)
Reduction in shares to cover individuals' tax withholding (in shares)   (2)      
Stock-based compensation     8,539   8,539
Balances at Mar. 31, 2017   $ 9 989,411 (290,632) 698,788
Balances (in shares) at Mar. 31, 2017 6 92,948      
Balances at Dec. 31, 2016   $ 9 592,663 (479,984) 112,688
Balances (in shares) at Dec. 31, 2016   92,991      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)         628,816
Balances at Sep. 30, 2017   $ 15 1,013,141 148,832 1,161,988
Balances (in shares) at Sep. 30, 2017   149,666      
Balances at Mar. 31, 2017   $ 9 989,411 (290,632) 698,788
Balances (in shares) at Mar. 31, 2017 6 92,948      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       20,177 20,177
Conversion of preferred stock   $ 6 (6)    
Conversion of preferred stock (in shares) (6) 55,180      
Offering costs     (90)   (90)
Long-term incentive plan grants (in shares)   2,022      
Long-term incentive plan forfeitures (in shares)   (48)      
Stock-based compensation     13,154   13,154
Balances at Jun. 30, 2017   $ 15 1,002,469 (270,455) 732,029
Balances (in shares) at Jun. 30, 2017   150,102      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       419,287 419,287
Long-term incentive plan forfeitures (in shares)   (143)      
Reduction in shares to cover individuals' tax withholding     (1,828)   (1,828)
Reduction in shares to cover individuals' tax withholding (in shares)   (293)      
Stock-based compensation     12,500   12,500
Balances at Sep. 30, 2017   $ 15 1,013,141 148,832 1,161,988
Balances (in shares) at Sep. 30, 2017   149,666      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (93,130) (93,130)
Long-term incentive plan forfeitures (in shares)   (266)      
Reduction in shares to cover individuals' tax withholding     (150)   (150)
Reduction in shares to cover individuals' tax withholding (in shares)   (21)      
Stock-based compensation     3,290   3,290
Balances at Dec. 31, 2017   $ 15 1,016,281 55,702 1,071,998
Balances (in shares) at Dec. 31, 2017   149,379      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (2,598) (2,598)
Common stock issuance   $ 1 63,479   63,480
Common stock issuance (in shares)   9,200      
Offering costs     (3,044)   (3,044)
Stock option exercises     323   323
Stock option exercises (in shares)   42      
Long-term incentive plan grants (in shares)   1,922      
Long-term incentive plan forfeitures (in shares)   (74)      
Stock-based compensation     4,066   4,066
Balances at Mar. 31, 2018   $ 16 1,081,105 53,104 1,134,225
Balances (in shares) at Mar. 31, 2018   160,469      
Balances at Dec. 31, 2017   $ 15 1,016,281 55,702 1,071,998
Balances (in shares) at Dec. 31, 2017   149,379      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)         (100,709)
Balances at Sep. 30, 2018   $ 16 1,091,441 (45,007) 1,046,450
Balances (in shares) at Sep. 30, 2018   160,676      
Balances at Mar. 31, 2018   $ 16 1,081,105 53,104 1,134,225
Balances (in shares) at Mar. 31, 2018   160,469      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (16,274) (16,274)
Long-term incentive plan grants (in shares)   320      
Long-term incentive plan forfeitures (in shares)   (136)      
Reduction in shares to cover individuals' tax withholding     (262)   (262)
Reduction in shares to cover individuals' tax withholding (in shares)   (53)      
Stock-based compensation     5,194   5,194
Balances at Jun. 30, 2018   $ 16 1,086,037 36,830 1,122,883
Balances (in shares) at Jun. 30, 2018   160,600      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (81,837) (81,837)
Long-term incentive plan grants (in shares)   84      
Long-term incentive plan forfeitures (in shares)   (8)      
Stock-based compensation     5,404   5,404
Balances at Sep. 30, 2018   $ 16 $ 1,091,441 $ (45,007) $ 1,046,450
Balances (in shares) at Sep. 30, 2018   160,676