XML 50 R23.htm IDEA: XBRL DOCUMENT v2.4.0.6
Description of business and basis of presentation (Tables)
6 Months Ended
Jun. 30, 2012
Description of business and basis of presentation [Abstract]  
Summary of the carrying values and estimated fair values of the Company's senior convertible notes due
                                 
    June 30, 2012     December 31, 2011  
    Carrying
value
    Estimated
fair value
    Carrying
value
    Estimated
fair value
 

Notes due 2013

  $ 114.1     $ 60.4     $ 113.9     $ 61.0  

Notes due 2015

  $ 97.1     $ 56.8     $ 96.8     $ 60.8  
Changes in fair value of the Company's Level 3 financial assets and liabilities
                                 
    Three months ended
June 30, 2012
    Six months ended
June 30, 2012
 
    Forward
Purchase
Contract
    Warrant
Liability
    Forward
Purchase
Contract
    Warrant
Liability
 

Beginning Balance

  $ 744     $ (7,915 )   $ —       $ —    

Issuance

    —         —         1,080       (7,631

Adjustments to fair value

    12,347       2,993       12,011       2,709  

Transfers to additional paid-in-capital

    (13,091     —         (13,091     —    
   

 

 

   

 

 

   

 

 

   

 

 

 

Ending Balance

  $ —       $ (4,922   $ —       $ (4,922