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Debt (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2012
Debt Disclosure [Abstract] |
Principal amount, carrying amount, and interest expense of the notes | The following tables provide additional information regarding the Convertible Notes:
| June 30, 2012 |  | December 31, 2011
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount | (23.4 | ) |  | (27.0 | )
Carrying amount, net of discount | $ | 151.6 |  |  | $ | 148.0 |
|  | Quarter Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
Contractual coupon interest |  | $ | 1.9 |  |  | $ | 1.9 |  |  | $ | 3.9 |  |  | $ | 3.9 |
Amortization of discount and deferred financing costs |  | 2.1 |  |  | 1.9 |  |  | 4.1 |  |  | 3.8 |
Total interest expense1 |  | $ | 4.0 |  |  | $ | 3.8 |  |  | $ | 8.0 |  |  | $ | 7.7 |
______________________
1 | A portion of the interest relating to the Convertible Notes is capitalized as Construction in progress.
The following tables provide additional information regarding the Senior Notes:
| Quarter Ended
| June 30,
| 2012
Contractual coupon interest | $ | 2.0 |
Amortization of deferred financing costs | 0.1 |
Total interest expense1 | $ | 2.1 |
______________________
1 | A portion of the interest relating to the Senior Notes is capitalized as Construction in progress.

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