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Fair Value Measurements (Tables)
 3 Months Ended
Apr. 01, 2016
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Financial Instruments That Are Not Carried At Fair Value
The following table presents the carrying value and fair value of financial instruments that are not carried at fair value:
 
 
April 1, 2016
 
December 31, 2015
 
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
In thousands
 
 
 
 
 
 
 
 
Long-term debt:
 
 
 
 
 
 
 
 
Level 1
 
$
111,584

 
$
148,452

 
$
111,058

 
$
140,156

Level 2
 
337,569

 
316,126

 
329,763

 
305,681

Total
 
$
449,153

 
$
464,578

 
$
440,821

 
$
445,837