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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Earnings Per Share Reconciliation [Abstract] |  |  |
Net Income (Loss) | $ (222,337) | $ 61,092 |
Less: undistributed income allocated to participating securities | 0 | 693 |
Net income (loss) attributable to common stockholders | (222,337) | 60,399 |
Plus: Net income effect of convertible securities | 0 | 2,756 |
Numerator for diluted income (loss) per common share | $ (222,337) | $ 63,155 |
Basic weighted-average common stock shares outstanding (in shares) | 53,153 | 49,127 |
Dilutive effects of common stock equivalents (in shares) | 0 | 6,423 |
Diluted weighted-average common stock shares outstanding (in shares) | 53,153 | 55,550 |
Basic income (loss) per share (in dollars per share) | $ (4.18) | $ 1.23 |
Diluted income (loss) per share (in dollars per share) | $ (4.18) | $ 1.14 |
5.00% Convertible Senior Notes due 2021 |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |
Debt instrument, interest rate | 5.00% |  |
Restricted Stock Awards |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  | 359 |
Stock Option Awards |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  | 1,900 |
Convertible Debt Securities | 5.00% Convertible Senior Notes due 2021 |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |
Debt instrument, interest rate | 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) | 249 |  | 354

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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