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Note 6 - Fair Value of Assets and Liabilities (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
Fair Value Measurements Using
   
 
 
 
(in
thousands
)
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
   
Significant
Other
Observable
Inputs
(Level 2)
   
Significant
Unobservable
Inputs
(Level 3)
   
Total
 
Investments in equity securities
  $
14,754
    $
    $
    $
14,754
 
Mutual funds
   
9,852
     
     
     
9,852
 
   
Fair Value Measurements Using
   
 
 
 
(in
thousands
)
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
   
Significant
Other
Observable
Inputs
(Level 2)
   
Significant
Unobservable
Inputs
(Level 3)
   
Total
 
Investments in equity securities
  $
10,993
    $
    $
    $
10,993
 
Mutual funds
   
7,962
     
     
     
7,962
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
March 31
, 201
8
   
December 30
, 201
7
 
(in
thousands
)
 
Carrying
Value
   
Estimated
Fair Value
   
Carrying
Value
   
Estimated
Fair Value
 
Euro Senior Notes, Series A due 2023
  $
144,041
    $
142,038
    $
139,623
    $
138,294
 
Euro Senior Notes, Series B due 2028
   
116,956
     
113,953
     
113,369
     
111,579
 
USD Senior Notes, Series A due 2022
   
25,000
     
24,301
     
25,000
     
24,737
 
USD Senior Notes, Series B due 2027
   
100,000
     
96,475
     
100,000
     
99,992
 
USD Senior Notes, Series A due 2025
   
50,000
     
48,081
     
     
 
USD Senior Notes, Series B due 2030
   
125,000
     
118,303