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Fair Value Measurements (Tables)
9 Months Ended
Sep. 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 September 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
 
$
13,382
 
 
$
-
 
 
$
-
 
 
$
13,382
 
Derivative assets
 
$
-
 
 
$
172
 
 
$
-
 
 
$
172
 
Derivative liabilities
 
$
-
 
 
$
(8,467
)
 
$
-
 
 
$
(8,467
)
Vessels (1)
 
$
-
 
 
$
37,070
 
 
$
-
 
 
$
37,070