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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2012
Debt Disclosure [Abstract] |
Principal amount, carrying amount, and interest expense of the notes | The following tables provide additional information regarding the Convertible Notes:
| December 31, 2012 |  | December 31, 2011
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount 1 | (19.7 | ) |  | (27.0 | )
Carrying amount, net of discount | $ | 155.3 |  |  | $ | 148.0 |
________________ 1 The remaining unamortized issuance discount at December 31, 2012 will be amortized over the next 2.3 years assuming no early conversion. See “Fair Values of Financial Assets and Liabilities - All Other Financial Assets and Liabilities” in Note 13 for information relating to the estimated fair value of the Convertible Notes.
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Contractual coupon interest | $ | 7.9 |  |  | $ | 8.4 |  |  | $ | 6.0 |
Amortization of discount and deferred financing costs | 8.5 |  |  | 7.8 |  |  | 5.3 |
Total interest expense 1 | $ | 16.4 |  |  | $ | 16.2 |  |  | $ | 11.3 |
____________
1 | A portion of the interest relating to the Convertible Notes is capitalized as Construction in progress.

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