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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2012
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 certain of our financial assets and financial liabilities measured at fair value on a recurring and non-recurring basis as of June 30, 2012, segregated by the above-described levels of valuation inputs:

(Amounts in thousands)
 
Level 1 Inputs
  
Level 2 Inputs
  
Level 3 Inputs
  
Total Fair Value
 
              
Marketable securities
 $13,111  $-  $-  $13,111 
Derivative assets
 $-  $42  $-  $42 
Derivative liabilities
 $-  $(8,189) $-  $(8,189)
Vessels (1)
 $-  $37,070  $-  $37,070 

 
(1)
Represents the appraised fair value of our Rail-Ferry vessels after the impairment charge taken in the third quarter of 2010. The valuation technique used was a weighted average of the cost, comparable sales and income approaches. The carrying value of the Rail-Ferry vessels ($33.2 million as of June 30, 2012) no longer equals the fair value.