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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Measurements [Abstract]  
Summary of financial assets and financial liabilities measured at fair value on a recurring and non-recurring basis
The following table summarizes our financial assets and financial liabilities measured at fair value on a recurring and non-recurring basis as of June 30, 2013, segregated by the above-described levels of valuation inputs:

(Amounts in thousands)
 
Level 1 Inputs
  
Level 2 Inputs
  
Level 3 Inputs
  
Total Fair Value
 
              
Derivative assets
 $-  $70  $-  $70 
Derivative liabilities
 $-  $(5,349) $-  $(5,349)