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Fair Value (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value [Abstract]  
Fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis
             

December 31, 2012:

  Level 2   Level 3   Total
    (in thousands)   (in thousands)   (in thousands)

Derivative instruments

  $1,780   $309   $2,089

 

             

December 31, 2011:

  Level 2   Level 3   Total
    (in
thousands)
  (in
thousands)
  (in
thousands)

Derivative instruments

  $2,487   $7,712   $10,199
Schedule of changes in fair value of Level 3 financial instruments
                 
    Year Ended December 31,  
        2012             2011      

Beginning Balance

  $ 7,712     $ 13,306  

Change in fair value

    (7,403     (5,594
   

 

 

   

 

 

 

Ending Balance

  $ 309     $ 7,712