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Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2011
Unvested Restricted Stock |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive securities (shares) | 6.2 | 5.3 | 6.5 | 5.3 |  |
Convertible Debt Securities |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive securities (shares) |  |  |  | 13.8 |  |
Warrant |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive securities (shares) |  |  | 9.2 | 10.8 |  |
Convertible notes payable |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Principal |  |  |  |  | $ 316.3 |
Convertible Senior Notes Due June 2018 | Convertible notes payable |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Principal |  |  |  |  |  | $ 316.3
Interest rate |  |  |  |  |  | 2.75%
Maximum number of convertible instruments (shares) |  |  |  | 3.0 |  |

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