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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Carrying Values and Estimated Fair Values of Senior Convertible Notes | The following is a summary of the carrying values and estimated fair values of the Company’s senior convertible notes due in 2013 and 2015 (in millions).
|  | December 31, 2011 |  |  | December 31, 2012 |
|  | Carrying value |  |  | Estimated fair value |  |  | Carrying value |  |  | Estimated fair value |
2013 notes |  | $ | 113.9 |  |  | $ | 61.0 |  |  | $ | 114.4 |  |  | $ | 81.9 |
2015 notes |  | $ | 96.8 |  |  | $ | 60.8 |  |  | $ | 97.6 |  |  | $ | 63.2 |
Summary of Changes in Fair Value of Company's Level Three Forward Purchase Contracts | The following roll-forward provides a summary of the changes in fair value of the Company’s Level 3 forward purchase contracts during the year ended December 31, 2012 (in thousands) :
|  | The February 2012 Forward Purchase Contract |  |  | The October 2012 Forward Purchase Contract |  |  | Total |
Beginning Balance |  | $ | — |  |  | $ | — |  |  | $ | — |
Issuance |  |  | 1,080 |  |  |  | 28,237 |  |  |  | 29,317 |
Adjustments to fair value included in other income (expense) |  |  | 12,011 |  |  |  | (13,248 | ) |  |  | (1,237 | )
Transfers to additional paid-in-capital |  |  | (13,091 | ) |  |  | (14,989 | ) |  |  | (28,080 | )
Ending Balance |  | $ | — |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of the fair value measurement of financial instruments classified in shareholders' equity using significant unobservable inputs (level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of level 3 (for example, transfers due to changes in the observability of significant inputs) by class of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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