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Description of business and basis of presentation (Tables) | 6 Months Ended
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Jun. 30, 2013
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 2013 notes and the Company’s senior convertible notes due in 2015 (the “2015 notes”) (in millions).
|  | June 30, 2013 |  |  | December 31, 2012 |
|  | Carrying value |  |  | Estimated fair value |  |  | Carrying value |  |  | Estimated fair value |
Notes due 2013 |  | $ | 114.7 |  |  | $ | 113.3 |  |  | $ | 114.4 |  |  | $ | 81.9 |
Notes due 2015 |  | $ | 98.0 |  |  | $ | 109.9 |  |  | $ | 97.6 |  |  | $ | 63.2 |
Changes in Fair Value of Level 3 Forward Purchase Contract | The following roll-forward provides a summary of changes in fair value of the Company’s Level 3 forward purchase contract (in thousands):
|  | Three months ended June 30, 2012 |  |  | Six months ended June 30, 2012 |
|  | Forward Purchase Contract |  |  | Forward Purchase Contract |
Beginning Balance |  | $ | 744 |  |  | $ | — |
Issuance |  |  | — |  |  |  | 1,080 |
Adjustments to fair value included in other income |  |  | 12,347 |  |  |  | 12,011 |
Transfers to additional paid-in-capital |  |  | (13,091 | ) |  |  | (13,091 | )
Ending Balance |  | $ | — |  |  | $ | — |

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- Definition Schedule of carrying value and estimated fair value of senior notes. + References No definition available. + Details
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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 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: 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=25499696&loc=d3e19207-110258 + Details
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