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Fair Value Measurement (Tables)
 6 Months Ended
Jun. 29, 2013
Fair Value Disclosures [Abstract]  
Fair value measured on recurring basis
The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value. 

 
 
Fair Value Measurements at June 29, 2013 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)
Assets:
 
 
 
 
Derivative instruments
$
2,722

$
—

$
2,722

$
—

Total Assets
$
2,722

$
—

$
2,722

$
—

 
 
 
 
 
Liabilities:
 
 
 
 
Derivative instruments
$
290

$
—

$
290

$
—

Senior Notes
276,563

—

276,563

—

Total Liabilities
$
276,853

$
—

$
276,853

$
—