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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Net income | $ (5,822) | $ 18,824 | $ 25,541 | $ 53,616
Undistributed income allocated to participating securities | 0 | 238 | 361 | 685
Net income (loss) attributable to common stockholders | (5,822) | 18,586 | 25,180 | 52,931
Plus: Net income effect of convertible securities | 0 | 2,566 | 0 | 0
Numerator for diluted income (loss) per common share | $ (5,822) | $ 21,152 | $ 25,180 | $ 52,931
Basic weighted-average common stock shares outstanding (in shares) | 45,709 | 45,561 | 45,676 | 45,505
Dilutive effects of common stock equivalents (in shares) | 0 | 6,431 | 45 | 22
Diluted weighted-average common stock shares outstanding (in shares) | 45,709 | 51,992 | 45,721 | 45,527
Basic income (loss) per share (USD per share) | $ (0.13) | $ 0.41 | $ 0.55 | $ 1.16
Diluted income (loss) per share (USD per share) | $ (0.13) | $ 0.41 | $ 0.55 | $ 1.16
5.00% Convertible Senior Notes due 2021 |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Debt instrument, interest rate | 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 | 354 | 354 | 354
Restricted Stock Awards |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  | 31 | 33 | 83
Stock Option Awards |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  | 1,300 | 1,300 | 1,500
Convertible Debt Securities |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 6,400 |  | 6,400 | 6,400

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