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Note 6 - Debt (Details Textual)
$ in Thousands, € in Millions, ¥ in Millions
12 Months Ended 25 Months Ended 30 Months Ended
Jan. 16, 2018
USD ($)
Oct. 13, 2017
USD ($)
Mar. 04, 2016
USD ($)
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Nov. 15, 2017
USD ($)
Oct. 12, 2017
USD ($)
Feb. 15, 2017
USD ($)
Dec. 08, 2016
USD ($)
Dec. 08, 2016
EUR (€)
Dec. 27, 2014
USD ($)
Dec. 27, 2014
CNY (¥)
Payments of Debt Issuance Costs       $ 1,626 $ 3,583 $ 42                  
Interest Paid       13,400 $ 8,600 $ 4,100                  
Bank of America [Member]                              
Payments of Debt Issuance Costs       $ 2,600                      
Euro Senior Notes, Series A and B [Member]                              
Debt Instrument, Face Amount | €                         € 212    
Euro Senior Notes, Series A [Member]                              
Debt Instrument, Face Amount                       $ 117,000      
Debt Instrument, Interest Rate, Stated Percentage                       1.14% 1.14%    
Euro Senior Notes, Series B [Member]                              
Debt Instrument, Face Amount | €                         € 95    
Debt Instrument, Interest Rate, Stated Percentage                       1.83% 1.83%    
U.S. Senior Notes, Series A and B [Member]                              
Debt Instrument, Face Amount                       $ 125,000      
U.S. Senior Notes, Series A [Member]                              
Debt Instrument, Face Amount                     $ 25,000        
Debt Instrument, Interest Rate, Stated Percentage                     3.03%        
U.S. Senior Notes, Series B [Member]                              
Debt Instrument, Face Amount                     $ 100,000        
Debt Instrument, Interest Rate, Stated Percentage                     3.74%        
US Senior Notes A and B Due 2025 and 2030 [Member]                              
Debt Instrument, Face Amount                 $ 175,000            
Entrustment Loan [Member]                              
Debt Instrument, Interest Rate, Stated Percentage                           5.25% 5.25%
Entrusted Loan                           $ 17,900 ¥ 110
Subsequent Event [Member] | US Senior Notes A Due 2025 [Member]                              
Debt Instrument, Face Amount $ 50,000                            
Debt Instrument, Interest Rate, Stated Percentage 3.48%                            
Subsequent Event [Member] | US Senior Notes B Due 2030 [Member]                              
Debt Instrument, Face Amount $ 125,000                            
Debt Instrument, Interest Rate, Stated Percentage 3.78%                            
Credit Agreement [Member]                              
Debt Instrument, Term     5 years                        
Debt Agreement, Maximum Borrowing Capacity     $ 700,000                        
Line of Credit Facility, Additional Uncommitted Borrowing Capacity   $ 300,000 150,000                        
Line of Credit Facility, Additional Uncommitted Borrowing Capacity, Minimum Increments     $ 25,000                        
Number of Advances   2                          
Debt Instrument, Interest Rate, Effective Percentage       3.07%                      
Letters of Credit Outstanding, Amount       $ 100                      
Credit Agreement [Member] | Minimum [Member]                              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.15%                        
Credit Agreement [Member] | Maximum [Member]                              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.25%                        
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                              
Debt Instrument, Basis Spread on Variable Rate     1.00%                        
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                              
Debt Instrument, Basis Spread on Variable Rate     2.00%                        
Credit Agreement [Member] | Base Rate [Member] | Minimum [Member]                              
Debt Instrument, Basis Spread on Variable Rate     0.00%                        
Credit Agreement [Member] | Base Rate [Member] | Maximum [Member]                              
Debt Instrument, Basis Spread on Variable Rate     1.00%                        
Credit Agreement [Member] | Revolving Credit Facility [Member]                              
Line of Credit Facility, Maximum Borrowing Capacity   $ 700,000 $ 575,000             $ 575,000          
Line of Credit Facility, Remaining Borrowing Capacity       $ 699,900                      
Credit Agreement [Member] | Term Loan Credit Facility [Member]                              
Line of Credit Facility, Maximum Borrowing Capacity   200,000 $ 125,000             $ 125,000          
Proceeds from Issuance of Long-term Debt   $ 125,000                          
Debt Instrument, Quarterly Payments, Percentage of Loan       1.25%                      
Debt Instrument, Periodic Payment       $ 1,600                      
Credit Agreement [Member] | Term Loan Credit Facility [Member] | Subsequent Event [Member]                              
Proceeds from Issuance of Long-term Debt $ 75,000                            
Debt Instrument, Periodic Payment $ 2,500                            
Credit Agreement [Member] | Term Loan Credit Facility [Member] | Scenario, Forecast [Member]                              
Line of Credit Facility, Periodic Payment, Principal             $ 1,600 $ 3,100              
Bank of America [Member]                              
Payments of Debt Issuance Costs       $ 1,600