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Description of business and basis of presentation (Tables)
3 Months Ended
Mar. 31, 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).

 

 

     March 31, 2013      December 31, 2012  
     Carrying
value
     Estimated
fair value
     Carrying
value
     Estimated
fair value
 

Notes due 2013

   $ 114.6       $ 102.2       $ 114.4       $ 81.9   

Notes due 2015

   $ 97.8       $ 83.8       $ 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
March 31,
2013
     Three months
ended
March 31,
2012
 

Beginning balance

   $ —        $ —    

Issuance

     —          1,080   

Unrealized gain/(loss) included in other income (expense)

     —          (336
  

 

 

    

 

 

 

Ending balance

   $ —        $ 744