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Income (Loss) per Share - Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jul. 14, 2016
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |
Net income (loss) | $ 18,824 | $ (27,761) | $ 53,616 | $ (59,522) |
Undistributed income allocated to participating securities | 238 | 0 | 685 | 0 |
Net income (loss) attributable to common stockholders | 18,586 | (27,761) | 52,931 | (59,522) |
Plus: Net income effect of convertible securities | 2,566 | 0 | 0 | 0 |
Numerator for diluted income (loss) per common share | $ 21,152 | $ (27,761) | $ 52,931 | $ (59,522) |
Basic weighted-average common stock shares outstanding (in shares) | 45,561 | 41,580 | 45,505 | 41,309 |
Dilutive effects of common stock equivalents (in shares) | 6,431 | 0 | 22 | 0 |
Diluted weighted-average common stock shares outstanding (in shares) | 51,992 | 41,580 | 45,527 | 41,309 |
Basic income (loss) per share (USD per share) | $ 0.41 | $ (0.67) | $ 1.16 | $ (1.44) |
Diluted income (loss) per share (USD per share) | $ 0.41 | $ (0.67) | $ 1.16 | $ (1.44) |
5.00% Convertible Senior Notes due 2021 |  |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |
Debt instrument, interest rate | 5.00% |  | 5.00% |  | 5.00%
Warrant |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average number of shares issuable under the common stock warrants (in shares) | 354 | 352 | 354 | 352 |
Restricted Stock Awards |  |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 31 | 463 | 83 | 448 |
Stock Option Awards |  |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 1,300 | 1,700 | 1,500 | 1,700 |
Convertible Debt Securities |  |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  | 6,400 | 6,400 | 2,300 |

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