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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2012
Fair Value Measurements  
Schedule of assets and liabilities measured at fair value on a recurring basis
  September 30, 2012  
 
  Level 1   Level 2   Level 3   Total  
 
  (in thousands)
 

Location and Description

                         

Cash equivalents

  $ 173,844   $   $   $ 173,844  

Other current assets (marketable securities)

    36             36  

Other current assets (other derivative agreements)

                 

Other long-term assets (other derivative agreements)

                 
                   

Total Assets

  $ 173,880   $   $   $ 173,880  
                   

Other current liabilities (other derivative agreements)

        (107,028 )       (107,028 )

Other current liabilities (interest rate swap)

        (828 )       (828 )

Other long-term liabilities (other derivative agreements)

        (8,733 )       (8,733 )

Other long-term liabilities (interest rate swap)

        (2,186 )       (2,186 )
                   

Total Liabilities

  $   $ (118,775 ) $   $ (118,775 )
                   

 
  December 31, 2011  
 
  Level 1   Level 2   Level 3   Total  
 
  (in thousands)
 

Location and Description

                         

Cash equivalents

  $ 187,327   $   $   $ 187,327  

Other current assets (marketable securities)

    25             25  

Other current assets (other derivative agreements)

        63,051         63,051  

Other long-term assets (other derivative agreements)

        18,831         18,831  
                   

Total Assets

  $ 187,352   $ 81,882   $   $ 269,234  
                   

Other current liabilities (interest rate swap)

        (905 )       (905 )

Other long-term liabilities (interest rate swap)

        (1,483 )       (1,483 )
                   

Total Liabilities

  $   $ (2,388 ) $   $ (2,388 )