v3.8.0.1

Debt - 6.00% Senior Convertible Notes due 2020 (Details) - USD ($) | Jun. 23, 2015 | Jun. 17, 2015 | Dec. 31, 2017 | Dec. 31, 2016
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6.00% Senior Convertible Notes Due 2020 |  |  |  |
Debt |  |  |  |
Stated interest rate (percent) | 6.00% |  |  |
Aggregate principal amount | $ 80,000,000 |  |  |
Proceeds from notes | 64,500,000 |  |  |
7.50% Exchange Notes and 7.50% Notes |  |  |  |
Debt |  |  |  |
Cash paid for interest | 1,500,000 |  |  |
Amount of debt repurchased | $ 30,700,000 |  |  |
7.50% Senior Exchange Convertible Notes |  |  |  |
Debt |  |  |  |
Stated interest rate (percent) | 7.50% |  |  |
Amount of debt repurchased | $ 15,400,000 |  |  |
TPG Aviator, L.P. | 6.00% Senior Convertible Notes Due 2020 |  |  |  |
Debt |  |  |  |
Aggregate principal amount |  | $ 20,000,000 |  |
Ownership interest (as a percent) |  | 43.50% |  |
Proceeds from notes |  | $ 20,000,000 |  |
Senior Notes | 6.00% Senior Convertible Notes Due 2020 |  |  |  |
Debt |  |  |  |
Stated interest rate (percent) |  |  | 6.00% | 6.00%

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