Debt - 7.50% Senior Convertible Notes and 7.50% Senior Exchange Convertible Notes due 2016 (Details) - Senior Notes - USD ($) |
1 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
Jul. 20, 2015 |
Jul. 31, 2012 |
Dec. 31, 2016 |
Feb. 16, 2016 |
Jun. 23, 2015 |
Dec. 31, 2014 |
Feb. 04, 2011 |
|
| 7.50% Senior Convertible Notes due 2016 | |||||||
| Debt | |||||||
| Stated interest rate (percent) | 7.50% | 7.50% | 7.50% | 7.50% | 7.50% | ||
| Aggregate principal amount | $ 100,000,000 | ||||||
| Debt retired | $ 44,500,000 | ||||||
| Face amount of debt repurchased | $ 8,700,000 | ||||||
| 7.50% Senior Exchange Convertible Notes | |||||||
| Debt | |||||||
| Stated interest rate (percent) | 7.50% | 7.50% | 7.50% | 7.50% | |||
| Aggregate principal amount | $ 44,500,000 | ||||||
| Face amount of debt repurchased | $ 20,500,000 | ||||||
| Redemption price as a percentage of principal | 100.00% |