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Equity - Narrative (Details) - $ / shares |  | 18 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 22, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Oct. 04, 2016 | Oct. 01, 2016
Class of Stock |  |  |  |  |
Common stock, shares outstanding |  | 35,560,000 | 35,650,000 |  |
Common stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001 |  |
Common stock, shares authorized |  | 250,000,000 | 250,000,000 |  |
Beneficial ownership percentage to trigger shareholder rights plan | 15.00% |  |  |  |
Series A Warrants |  |  |  |  |
Class of Stock |  |  |  |  |
Plan of Reorganization, Equity Interest Issuable, Number of Shares |  | 4,600,000 |  |  |
Number of common shares exercised for each warrant |  |  |  |  | 1
Exercise price (in usd per share) |  |  |  |  | $ 41.34
Series B Warrants |  |  |  |  |
Class of Stock |  |  |  |  |
Plan of Reorganization, Equity Interest Issuable, Number of Shares |  | 1,900,000 |  |  |
Number of common shares exercised for each warrant |  |  |  | 1 |
Exercise price (in usd per share) |  |  |  |  | $ 42.03
Restricted Stock |  |  |  |  |
Class of Stock |  |  |  |  |
Unvested awards |  | 863,000 | 1,105,000 |  |

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