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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Additional Paid-In Capital | Retained Earnings (Accumulated Deficit) | Total
--- | --- | --- | --- | ---
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 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net income (loss) |  |  | 146,668 | 146,668
Long-term incentive plan forfeitures (in shares) | (43) |  |  |
Reduction in shares to cover individuals' tax withholding |  | (39) |  | (39)
Reduction in shares to cover individuals' tax withholding (in shares) | (20) |  |  |
Stock-based compensation |  | 3,965 |  | 3,965
Balances at Dec. 31, 2018 | $ 16 | 1,095,367 | 101,661 | 1,197,044
Balances (in shares) at Dec. 31, 2018 | 160,613 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net income (loss) |  |  | (336,559) | (336,559)
Long-term incentive plan grants (in shares) | 4,153 |  |  |
Long-term incentive plan forfeitures (in shares) | (193) |  |  |
Reduction in shares to cover individuals' tax withholding |  | (406) |  | (406)
Reduction in shares to cover individuals' tax withholding (in shares) | (253) |  |  |
Stock-based compensation |  | (6,416) |  | (6,416)
Balances at Mar. 31, 2019 | $ 16 | 1,088,545 | (234,898) | 853,663
Balances (in shares) at Mar. 31, 2019 | 164,320 |  |  |
Balances at Dec. 31, 2018 | $ 16 | 1,095,367 | 101,661 | 1,197,044
Balances (in shares) at Dec. 31, 2018 | 160,613 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net income (loss) |  |  |  | (1,040,687)
Balances at Sep. 30, 2019 | $ 16 | 1,087,441 | (939,026) | 148,431
Balances (in shares) at Sep. 30, 2019 | 162,217 |  |  |
Balances at Mar. 31, 2019 | $ 16 | 1,088,545 | (234,898) | 853,663
Balances (in shares) at Mar. 31, 2019 | 164,320 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net income (loss) |  |  | (640,844) | (640,844)
Long-term incentive plan grants (in shares) | 11 |  |  |
Long-term incentive plan forfeitures (in shares) | (166) |  |  |
Reduction in shares to cover individuals' tax withholding |  | (20) |  | (20)
Reduction in shares to cover individuals' tax withholding (in shares) | (42) |  |  |
Stock-based compensation |  | 1,358 |  | 1,358
Balances at Jun. 30, 2019 | $ 16 | 1,089,883 | (875,742) | 214,157
Balances (in shares) at Jun. 30, 2019 | 164,123 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net income (loss) |  |  | (63,284) | (63,284)
Long-term incentive plan forfeitures (in shares) | (1,742) |  |  |
Reduction in shares to cover individuals' tax withholding |  | (14) |  | (14)
Reduction in shares to cover individuals' tax withholding (in shares) | (164) |  |  |
Stock-based compensation |  | (2,428) |  | (2,428)
Balances at Sep. 30, 2019 | $ 16 | $ 1,087,441 | $ (939,026) | $ 148,431
Balances (in shares) at Sep. 30, 2019 | 162,217 |  |  |

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