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Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurements [Abstract]  
Fair value measured on recurring basis [Table Text Block]
The following table presents the Company's financial instruments that are measured at fair value on a recurring basis as of December 31, 2011 and are categorized using the fair value hierarchy under FASB authoritative guidance.  The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value.
        
 
 
Fair Value Measurements at December 31, 2011 Using
 
 
Quoted Prices in
Active Markets for
Identical Assets
Significant Other
Observable
Inputs
Significant
Unobservable
Inputs
(In thousands of dollars)
Total
(Level 1)
(Level 2)
(Level 3)
Derivative assets
$
6

$

$
6

$

Derivative liabilities
(836
)

(836
)

Total
$
(830
)
$

$
(830
)
$