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Cash Convertible Senior Notes and Related Transactions (Tables) | 3 Months Ended
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Mar. 31, 2012
Cash Convertible Senior Notes and Related Transactions [Abstract] |
Principal amount, carrying amount, and interest expense of the notes | The following tables provide additional information regarding the Notes:
| March 31, 2012 |  | December 31, 2011
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount | (25.2 | ) |  | (27.0 | )
Carrying amount, net of discount | $ | 149.8 |  |  | $ | 148.0 |
|  | Quarter Ended
|  | March 31,
|  | 2012 |  | 2011
Contractual coupon interest |  | $ | 2.0 |  |  | $ | 2.0 |
Amortization of discount and deferred financing costs |  | 2.0 |  |  | 1.9 |
Total interest expense 1 |  | $ | 4.0 |  |  | $ | 3.9 |
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1 | A portion of the interest relating to the Notes is capitalized as Construction in progress.

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