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Note 8 - Debt (Details Textual)
$ in Thousands, € in Millions, ¥ in Millions
1 Months Ended 12 Months Ended 25 Months Ended 30 Months Ended
Feb. 15, 2017
USD ($)
Dec. 08, 2016
EUR (€)
Mar. 04, 2016
USD ($)
May 31, 2013
USD ($)
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Dec. 27, 2014
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2016
CNY (¥)
Oct. 01, 2016
Dec. 27, 2014
CNY (¥)
Jan. 30, 2014
USD ($)
Jan. 29, 2014
USD ($)
Letters of Credit Outstanding, Amount           $ 100                
Loans Payable to Bank         $ 120,313 85,000                
Payments of Debt Issuance Costs         3,583 42 $ 107              
Entrusted Loan         3,522 9,474                
Interest Paid         8,600 4,100 4,900              
Euro Senior Notes, Series A and B [Member]                            
Proceeds from Notes Payable | €   € 212                        
Euro Senior Notes, Series A [Member]                            
Proceeds from Notes Payable | €   € 117                        
Debt Instrument, Interest Rate, Stated Percentage   1.14%                        
Euro Senior Notes, Series B [Member]                            
Proceeds from Notes Payable | €   € 95                        
Debt Instrument, Interest Rate, Stated Percentage   1.83%                        
U.S. Senior Notes, Series A and B [Member] | Subsequent Event [Member]                            
Proceeds from Notes Payable $ 125,000                          
U.S. Senior Notes, Series A [Member] | Subsequent Event [Member]                            
Proceeds from Notes Payable $ 25,000                          
Debt Instrument, Interest Rate, Stated Percentage 3.03%                          
U.S. Senior Notes, Series B [Member] | Subsequent Event [Member]                            
Proceeds from Notes Payable $ 100,000                          
Debt Instrument, Interest Rate, Stated Percentage 3.74%                          
Senior Notes [Member]                            
Payments of Debt Issuance Costs         1,800                  
Entrustment Loan Member                            
Debt Instrument, Interest Rate, Stated Percentage                     5.25%      
Entrusted Loan         3,500   $ 17,900     ¥ 24.5   ¥ 110.0    
JP Morgan Securities LLC [Member]                            
Line of Credit Facility, Expiration Period       5 years                    
Line of Credit Facility, Maximum Borrowing Capacity       $ 325,000                    
Loans Payable to Bank       100,000                    
Bank of America [Member]                            
Payments of Debt Issuance Costs         1,700                  
Unsecured Revolving Credit Facility [Member] | JP Morgan Securities LLC [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity       $ 225,000                 $ 275,000 $ 225,000
Line of Credit Facility, Remaining Borrowing Capacity           $ 197,900                
Line Of Credit Facility Increase in Maximum Borrowing Capacity                         $ 50,000  
Line of Credit Facility, Interest Rate at Period End           1.68%                
Unsecured Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | JP Morgan Securities LLC [Member]                            
Debt Instrument, Basis Spread on Variable Rate           1.25%                
Credit Agreement [Member]                            
Line of Credit Facility, Expiration Period     5 years                      
Line of Credit Facility, Maximum Borrowing Capacity     $ 700,000                      
Line of Credit Facility, Additional Uncommitted Borrowing Capacity     150,000                      
Line of Credit Facility, Additional Uncommitted Borrowing Capacity, Minimum Increments     $ 25,000                      
Debt Instrument, Interest Rate, Effective Percentage     2.27%                      
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     0.30%                      
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     $ 575,000                      
Line of Credit Facility, Remaining Borrowing Capacity         $ 462,400                  
Credit Agreement [Member] | Term Loan Credit Facility [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity     $ 125,000                      
Credit Agreement [Member] | Term Loan Credit Facility [Member] | Scenario, Forecast [Member]                            
Line of Credit Facility, Periodic Payment, Principal               $ 1,600 $ 3,100