v3.10.0.1

Debt - 6.00% Senior Convertible Notes due 2020 (Details) - USD ($) $ in Millions | Jun. 23, 2015 | Jun. 17, 2015 | Jun. 30, 2018 | Dec. 31, 2017
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6.00% Senior Convertible Notes Due 2020 |  |  |  |
Debt |  |  |  |
Stated interest rate (percent) |  |  | 6.00% | 6.00%
7.50% Exchange Notes and 7.50% Notes |  |  |  |
Debt |  |  |  |
Stated interest rate (percent) | 7.50% |  |  |
7.50% Senior Exchange Convertible Notes |  |  |  |
Debt |  |  |  |
Stated interest rate (percent) | 7.50% |  |  |
TPG Aviator, L.P. |  |  |  |
Debt |  |  |  |
Ownership percentage (percent) |  | 43.80% |  |
Senior Notes | 6.00% Senior Convertible Notes Due 2020 |  |  |  |
Debt |  |  |  |
Stated interest rate (percent) | 6.00% |  |  |
Aggregate principal amount | $ 80.0 |  |  |
Senior Notes | 7.50% Exchange Notes and 7.50% Notes |  |  |  |
Debt |  |  |  |
Cash paid for interest | $ 1.5 |  |  |
Senior Notes | TPG Aviator, L.P. | 6.00% Senior Convertible Notes Due 2020 |  |  |  |
Debt |  |  |  |
Aggregate principal amount |  | $ 20.0 |  |
Proceeds from notes |  | $ 20.0 |  |

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