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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) |  |  |  | 535,686 | 535,686
Sale of preferred stock |  |  | 352,048 |  | 352,048
Sale of preferred stock (in shares) | 6 |  |  |  |
Preferred beneficial conversion feature |  |  | 48,007 |  | 48,007
Conversion of preferred stock |  | $ 6 | (6) |  |
Conversion of preferred stock (in shares) | (6) | 55,180 |  |  |
Offering costs |  |  | (11,919) |  | (11,919)
Long-term incentive plan grants (in shares) |  | 2,022 |  |  |
Long-term incentive plan forfeitures (in shares) |  | (498) |  |  |
Reduction in shares to cover individuals' tax withholding |  |  | (1,995) |  | (1,995)
Reduction in shares to cover individuals' tax withholding (in shares) |  | (316) |  |  |
Stock-based compensation |  |  | 37,483 |  | 37,483
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) |  |  |  | (18,872) | (18,872)
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) |  | 2,242 |  |  |
Long-term incentive plan forfeitures (in shares) |  | (210) |  |  |
Reduction in shares to cover individuals' tax withholding |  |  | (262) |  | (262)
Reduction in shares to cover individuals' tax withholding (in shares) |  | (53) |  |  |
Stock-based compensation |  |  | 9,260 |  | 9,260
Balances at Jun. 30, 2018 |  | $ 16 | $ 1,086,037 | $ 36,830 | $ 1,122,883
Balances (in shares) at Jun. 30, 2018 |  | 160,600 |  |  |

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