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Long-Term Debt and Credit Facility (Tables) | 3 Months Ended
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Mar. 31, 2013
Debt Disclosure [Abstract] |  |
Principal amount, carrying amount, and interest expense of the notes | The following tables provide additional information regarding the Convertible Notes:
| March 31, 2013 |  | December 31, 2012
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount | (17.7 | ) |  | (19.7 | )
Carrying amount, net of discount | $ | 157.3 |  |  | $ | 155.3 |
| Quarter Ended March 31,
| 2013 |  | 2012
Contractual coupon interest | $ | 2.0 |  |  | $ | 2.0 |
Amortization of discount and deferred financing costs | 2.2 |  |  | 2.0 |
Total interest expense 1 | $ | 4.2 |  |  | $ | 4.0 |
____________
1 | A portion of the interest relating to the Convertible Notes is capitalized as Construction in progress.
| [1]
[1] | A portion of the interest relating to the Convertible Notes is capitalized as Construction in progress.

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